By the way, here's how I check if I'm overweighted: At the end of a rec dive during my last safety stop at about 10' I lean slightly head down so all the gas (if any) goes to the back of my wing. I then reach back and squeeze the lower arc of the wing (for donuts) to see if there's any gas there. If there is then I'm overweighted and will leave some lead on the boat for the next dive. Of course, my tank probably has about 500 psi still in it, but that's about 1 lbs of negative buoyancy which I can easily effect with my lungs one way or the other, so basically there should be no gas in the wing at the end of the dive with tank almost empty at 10'. Sometimes I also run gas out of the tank at the end just to get it almost empty for the check.