Quote: (Originally Posted by
Rubis)

Well, a set of double 18s, 1 scooter and 5 stages is currently the max I can do on OC ...

The logistics of gas management just becomes ridiculous with extended bottom times, deep diving and long cave dives ...

Extended bottom times, as in "shallow dive with long cave penetration", that I can understand. Deep diving not, as what you will save in deco bottles will be offset by the bailout tanks you'll have to carry along. What kind of depths are you targeting ? Did you do the bailout calculations, including of course the non-optimized deco once you revert to OC ?
I can
only 
handle twin-15 and 3 stages (in open ocean), which is already plenty of gas, yet I did not move to rebreather because it was the tool needed for the job, but because of other reasons, among which: better deco, ligther for hopping from rock to rock when shore diving, getting closer to wildlife, and ... fun to discover a new toy

!