Demasoni: indeed that is a great thread, thanks! Thanks for responding too Naiad.
Sheepeck: maybe it's useful to mention that I never have had this problem before, I always have an easy relationship surface/bottom. Just this weekend it happened. I have also just taken to keeping an eye on the surface light through the bottom of my mask as I dive as a trick to maintain a neutral head position.
My very bad solution was to look down, and dive where it was "darkest" (but straining my neck and making EQ harder at same time...)
