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Little known fact that few recreational divers know, but many tec divers realize. Boyancy control actually gets easier the deeper you go and boyancy is the hardest to control at your 10/20 foot safety stop.
The reason is because pressure increases 1atm every 10 meters, so pressure doubles in that first 10 meters, but only increase by 10% between 100 and 110 meters. This means a small change in depth at shallow depths results in a large change in gas volume and as such your boyancy, so its easy to loose control because if you rise a few feet you might go from neutral to positive boyancy, as you float to the top this will just keep accelerating.
The best way to handle this is just to make sure you have as little weight on you as possible while still being able to sink. This means you need less air in your bcd to be neutral so there is less volume change and its easier to control.
