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You can also do the old BC "elevator thing:"TSandM:One thing I did get from my Rec 2 class with Joe Talavera was the idea that there is a buoyancy "window" of correction with breath, and once you are out of that window, you MUST use other means of correction. In other words, if you've gone up more than a foot or so, you will HAVE to dump air from the wing or the drysuit; breath alone will not stop you fast enough to prevent further ascent. This has helped with buoyancy in general, but I need to get much better at KEEPING myself within the "breath" window.
As you exhale put short bursts into the vest. When you just start to move up hold the vest inflator hose as far down (deep) as you are able. Now hold the oral inflation button open. Bring the hose up till air starts to flow out of the mouthpiece, then lower it till it just stops. You know have an air siphon from your vest that you can use to control your level. The only problem is that the direction is counterintuitive, raise the mouthpiece up to descend and lower it to ascend. Remember to keep it OPEN ALL THE TIME.
We once built a mechanical "stay here" buoyancy compensator for a small ROV that could be easily adapted to mount between a set of doubles. I'll describe it some time later.