bubbles,
Have you tried ankle weights to help with floaty feet? You can also get larger ones that will also fit around a drysuit ankle. Also if you get cramps in your foot, the fit of the foot pocket isn't right for the shape of your feet/or the sizing isn't right.
Also, where do you wear your weights? If you don't have a weight integrated BC, you can still get the ankle weights (approx 2lbs & 2.5-3lbs each) and strap them to the top of your tank. This extra weight will counteract the bouyancy of an AL80 at the safety stop, plus take some weight off the weight belt.