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How about some advice here... O2 breaks.... Do you use your back gas or your
previous gas? 
Example: Lets say you have back gas 17/55, deco 50/50 and O2.

I have heard two lines of reasoning for this question. One group says to get
away from the helium during deco that N uptake is much slower so you should
use your 50/50. The other group states that you are taking a break from the
O2 and should move to backgas not the higher O2 in the 50/50.

Personally I was taught to move back one gas for your breaks, in this case
the 50/50. Am I wrong here? Excuse any obvious ignorance as I was taught
commercially and now am now converting to planning and diving without the
surface support. When I was diving commercial this was a non issue, you
switched to air.

Thanks,
             Rick

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