I guess you did not read my posts. The majority of my dives are no stop. Only about 5% of my dives are light deco, mostly under 10 min, always under 15 min. You probably also missed my post about SurfGF and surfacing GF.
Enjoy your diving
You do understand what the GF hi of 95 means?
You have moved the surfacing control pressure value closer to the original ZH-L16C M value. i.e you have increased the allowable controlling surface tissue tension.
This will of course allow longer NDL times.
If the restriction is that you must only do dives within the NDL limit, then you have achieved your goal, i.e. you can now spend longer in the water before you cross the NDL threshold. However, this is done whilst increasing the risk of DCI.
If you move the GF-Hi down, then for the same bottom time, you will be required to do a decompression stop, increase total surface to surface time. But, when you exit the water your tissue tensions will be lower. (The amount of inert gas in the tissues will be reduced).
Someone in the thread said that Technical computers (Buhlmann + GF) allow 'Technical Divers' to be more aggressive. If anything, the opposite is true, those using GF's tend to move to a more conservative set of tables.
The major difference between 'Technical computers using Buhlmann and GF's (or VPM etc), over Recreational computers. Is that, Technical Dive computers, use open source unmodified algorithms such as the Buhlmann ZH-L16C, so we know what we are getting for our money.
The Recreational computers, Suunto (et al), use proprietary tables. Whilst they may state they are Buhlmann, RGBM etc, they are all 'padded' with additional manufacturers 'safety features'; cold water compensation, repetitive dive penalties, saw tooth profile penalties, etc.
(So the original assumption that Technical Divers run more aggressive profiles is partially correct, they have no padding.)
The reason that GF's are used, is to make the 'published' table (algorithm) more conservative (add padding).
There is a reason that Shearwater ships their computers with GF's of 30/70, this is the 'safe' setting.
(From memory, I believe the non-technical settings don't allow the GF's to be altered, just three basic settings, normal, conservative, aggressive - although that may be the Peregrine, or I have mis remembered.)
I do know divers who run GF Hi at 100. But these are on the backups, not the primary devices, these are the KYAGB plans. i.e. this is the plan to get out of the water alive, but with the likelihood of a helicopter ride to the nearest chamber.
My decompression theory is very 'rusty' these days. I also don't keep in touch with current thinking as much as I used to. However, like many, I have moved away from deep stop and VPM ( i never really used VPM), extending the shallow water stop and reducing surfacing tissue tension.
I was always taught, the most dangerous point is the NDL threshold.
Interestingly, having worked with a number of instructors who where taught by differing agencies, in differing countries under differing philosophies, it is the one constant - stay away from the NDL threshold.
One of the big advantages of the 'safety stop', other than the obvious, slowing the ascent. Is that the safety stop is a forced decompression stop, by definition, moving you further away from the NDL threshold by the time you finally surface.
Ultimately, we all choose the amount of risk we are prepared to take. I am, despite what many think, risk averse. Yes I dive a CCR, yes I do dive trimix, yes, I switched to Nitrox early. Yes, I do decompression dives.
I used to do long dives, with long decompression penalties on air. I would not do the same now, nitrox wasn't available then. Yes, long decompression hangs are not an issue, but, not on air. 20 minutes extra on the stop is preferred over a helicopter ride, or a ride in the big orange boat.
