It's hard to tell if that stick man is facing forwards or backwards
. In any case I'd say that from what I've read on the 10s of forums I've been looking at that there's no position that could guarantee you not being saved by convulsions (only full suspension which has its own problems I think) but this position looks like a more reliable one. Take that as you will.
Did you also say that you could only hit your carotid artery in a front leaning position?