Next week I will dive as follows: Jump from boat into water, current. We will have to dive to the bottom (52m) as fast as possible, no in water buddy check possible. We will use UPV to go down at max. speed. I hope we can do it within 2 min or less. No chance to switch SP manualy during descent. At target depth we must find the wreck, no time to loose. Current. I don't want to switch manually. In this case I will set autoswitch at 35m, always keeping an eye on the HUD.
On such a fast descent pO2 will probably spike if I switch to high SP at shallow depth. That's what I have learned here.
Dil will be 21/35.
Thanks for all the interessting posts.