It is true that everybody's physiology is different, and varies day-to-day as you say. In much the same way, the models we use to try to avoid DCS vary, so different models will produce different results. There are a few different types of models, and within a given type there are parameters which can be tuned to one's preference. And no matter who you are, how you dive, which model you choose, and whether you follow its guidance or not, there is always a non-zero chance of a DCS hit, always. Now with that in mind, let's look at a few different models.
Day 2 / Dive 1 on air was to 105'. My PADI RDP table suggests a maximum NDL time of 16 minutes. Punching this into my Shearwater's dive plan mode (in default recreational settings), I get just 11 minutes. It's a little hard to read the photos of your dive profile, but it looks like the 105' was a brief dip, and most of the bottom time was more like 100'. Using 100' instead, I get 20 minutes and 13 minutes, respectively. From the picture I can't say what your bottom was, but I betcha these two models would put you in mandatory deco for the first dive alone.
Assuming that you just baaaarely made it out in time, the PADI RDP would make you in pressure group O; after surface interval of 58 minutes, you are in pressure group E. An E diver on air going to 100' has an NDL of just 10 minutes. Again, it's a little hard to read the profile, but there was a good amount of time spent near the bottom, and the whole dive was 32 minutes -- almost certainly in mandatory deco range. Some other posters calculated things using different tools, but reached the same conclusion.
So, what do we make of this? Well, maybe some of the other posters are correct, and in some way you misused your computer. In that case, easy solution: you've got some homework to do to figure out the mistake and how to avoid it next time. Or maybe they're wrong, the computer was used as intended, but its results are quite different from what I have calculated here, and from what others calculated. That could totally be the case, and I would interpret it as the computer is not conservative enough. I mean, several other calculations put you in mandatory deco here, your computer said you were fine, and guess what, you got bent. If the computer was not misused in any way, then the only reasonable conclusion in my humble opinion, is that the computer is an unsafe piece of s***. Would you mind using the computer's planner mode to plan these dives, and see what it spits out?
Anyway, I am sorry to hear that you got bent while doing your best to avoid it, and am glad that it was minor and that you're OK. I'm not trying to be argumentative here. It's just that the results of that computer are strikingly different from other results. I want to know where the massive discrepancy came from, because it just doesn't seem right.
By the way, if you would like to learn more about diving physiology, decompression sickness, and how all of these models work, Mark Powell wrote a great book on this topic. It's called Deco for Divers, and it's available online for around $30 to $40. The book draws on decades of real studies of decompression illness, and compiles it all into a very layperson-readable format. There's not much math in the actual text of the book, which keeps it readable, but there are appendixes in the back for the gigantic nerds among us, if you're into that kind of thing. And the whole book is pretty short. I managed to read it about a month during my half-hour subway commutes to work (in the before-times when commuting via subway was a thing).
Day 2 / Dive 1 on air was to 105'. My PADI RDP table suggests a maximum NDL time of 16 minutes. Punching this into my Shearwater's dive plan mode (in default recreational settings), I get just 11 minutes. It's a little hard to read the photos of your dive profile, but it looks like the 105' was a brief dip, and most of the bottom time was more like 100'. Using 100' instead, I get 20 minutes and 13 minutes, respectively. From the picture I can't say what your bottom was, but I betcha these two models would put you in mandatory deco for the first dive alone.
Assuming that you just baaaarely made it out in time, the PADI RDP would make you in pressure group O; after surface interval of 58 minutes, you are in pressure group E. An E diver on air going to 100' has an NDL of just 10 minutes. Again, it's a little hard to read the profile, but there was a good amount of time spent near the bottom, and the whole dive was 32 minutes -- almost certainly in mandatory deco range. Some other posters calculated things using different tools, but reached the same conclusion.
So, what do we make of this? Well, maybe some of the other posters are correct, and in some way you misused your computer. In that case, easy solution: you've got some homework to do to figure out the mistake and how to avoid it next time. Or maybe they're wrong, the computer was used as intended, but its results are quite different from what I have calculated here, and from what others calculated. That could totally be the case, and I would interpret it as the computer is not conservative enough. I mean, several other calculations put you in mandatory deco here, your computer said you were fine, and guess what, you got bent. If the computer was not misused in any way, then the only reasonable conclusion in my humble opinion, is that the computer is an unsafe piece of s***. Would you mind using the computer's planner mode to plan these dives, and see what it spits out?
Anyway, I am sorry to hear that you got bent while doing your best to avoid it, and am glad that it was minor and that you're OK. I'm not trying to be argumentative here. It's just that the results of that computer are strikingly different from other results. I want to know where the massive discrepancy came from, because it just doesn't seem right.
By the way, if you would like to learn more about diving physiology, decompression sickness, and how all of these models work, Mark Powell wrote a great book on this topic. It's called Deco for Divers, and it's available online for around $30 to $40. The book draws on decades of real studies of decompression illness, and compiles it all into a very layperson-readable format. There's not much math in the actual text of the book, which keeps it readable, but there are appendixes in the back for the gigantic nerds among us, if you're into that kind of thing. And the whole book is pretty short. I managed to read it about a month during my half-hour subway commutes to work (in the before-times when commuting via subway was a thing).