carlk3 wrote:I have Atomic Split fins and am currently wearing 2x2lbs of ankle weights. For most of the dive, everything seems fine, but at the end of the dive my feet seem light.
I used to have a steel HP120 (the tall skinny 3500psi one with the 7/8" neck made by PST) that would do the same thing. My trim was fine at the beginning of the dive. However, when the tank emptied, the butt end of the tank would become lighter than the valve end - lifting my butt/feet. I knew I had to be more aware of moving the air from my feet when I used that tank in order to compensate for it. Moving the tank lower on the bcd actually made things worse, as it accentuated the "lift" from the lighter end of the tank. I had to move that tank higher (without letting the valve hit me in the head
).
I never had that problem with the HP100's (same PST, 3500psi, 7/8" neck). I still have several of those, and dive them all the time without any issues.