[DALESDIVER]

Rob,
      DECAP (Bill Hamilton), have been utilising heliox only, for all the dives on ccr deeper dives, also using bailouts of heliox, aka 50/50 & 80/20 offboards, nitrogen is a bad gas as it were, so by using a gradient profile for deco starting at 2/3rds dive depth with 10/90 heliox as onboard dill. you would be pulling 1 min every three till 1/3 dive depth then upping the stop times with a max of 16 @ 6 after 25 @ 80m...
It works , but the VR3 is still at 15m when you are back on the boat!

Also by eliminating nitrogen it is easier to offgas the helium with a steady but controlled ascent, as all the tables we are getting as rec. divers are still using o/c style stops, it is worth resaerching this a bit, if you put v-planner vpm-b on the standard level it is very near decap, but it still gives you very long stops at 6m...

People are currently trying to get Bill Hamilton to publish his work, so that we can all benefit from it.