Diver one of sixteen to die using high-tech gear

[DRE]

I misread - I thought you were using 80/20GF's, with 80/30GF's I get out in 59min.
As far as multilevel profiles are concerned, these can be calculated as well, and won't give a hugely different deco curve - you can even calculate them as separate dives and then look at what the leading tissue group is for any combination.
CCR's do not have an advantage over OC with regards to deco (depending on how you do your deco - I prefer using a combination of VPM and Buhlmann models instead of running straight Buhlmann, what is what you guys do).