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Off gassing at your safety stop occurs during the process of breathing. If you slow your breathing down to conserve air on your safety stop, aren't you also slowing down the offgassing process? Wouldn't this increase the time required for the deco stop? It seems like conserving air at the safety stop would be detrimental to the whole deco stop process.
MASS-Diver once bubbled...
Snip
Again, this is just my guess. I'd conserve the air and stay down as long I could.
Spectre once bubbled...
However can you download the profile, and give us the profile numbers for all the dives in the series and the surface interval times? I tried running it and had to overstay for almost 40% longer than the NDL to get the thing to kick to 12 minutes deco @ 10.