trim adjustments

Hi everyone I‘ve been reading this forum for a long time and I‘ve just recently decided to start my first thread. I just bought a pair of Jet Fins since I read everywhere that they where the best for cave7tech diving diving, which is mostly what I do since I live in cave diving paradise. Also I...

I'm an experienced diver (Master Diver with 100 dives per year for the last 4 years) and have been able to establish perfect trim and buoyancy in my recreational kit. During the last two sessions of Tech 40, I have been unable to keep my head up in a horizontal position. Its as if someone put 20...