Buoyant1
Contributor
I usually practice deploying it on a safety stop, just to make sure it's part of my "muscle memory".
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Some interesting ideas, especially later in your post, that to me sound more in the tech diving realm. The thing I wanted to respond to here is that if you're using a non-recreational blend (50%O2) I think you're clearly talking about deco gas, not a bailout bottle, unless you have a hard bottom of 60ft.
If by some chance an OOA diver went for this gas (thinking it was an octo due to the way the reg is routed) at a significantly greater depth there could be big problems. I guess it's a matter of judgment. I would handle this bottle exactly as a deco stage, clearly marked as such.
1. First dive to 86 ft on 33%.. for 56 minutes using the pony for 50 ft up... with 1300 psi left in my 117 cf tank...
2. Surface interval of 51 minutes.
3. Second dive to 83 ft on 36% for 51 minutes, did not use pony, with 1230 psi left at end of dive (not using pony resulted in more main tank usage).
Are those run times or do they include your ascent and safety stop? And how much time do you spend at the safety stop?