I left my ADV on my rEvo, even though my instructor and most of the local rEvo divers have theirs turned off. When I finally turned it off (after 130 hours), there was a world of difference/improvement to my bouancy and the way I dived the unit. In fact I realised I was using the ADV to maintain bouancy (more than loop volume) that mean't the solenoid was kicking in to get back to setpoint, and then I would end up burping a whole lot of O2 out the OPV or through my nose / side of my DSV.
Now that I have turned it off, bouancy and gas consumption have improved dramatically.
I have only done 2 dives post course on the Chop, but I forgot to turn ADV off using in line shut off (at bottom depth) and bouyancy was OK, but went through significant amounts of O2, The solenoid clicked in after each dil addition (* where it doen't click in so much on the rEvo because of the Constant Mass Flow / leaky valve). So I need more practice and get use to using in line shut off.