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The amount of air that everyone adds depends greatly on the rig they're using and how they're weighted. As far as practicing, just pick different depths and try to descend to it and stop within a certain amount of that depth (example: 60ft +/- 1ft). Work on platforms if you have a dive site with them installed. Try to hover 2 ft above, and work closer and closer. Controlling your bouyancy with the amount you inhale and exhale will go a long way as well. When you're neutral, you should be able to ascend or descend with your lungs. Try performing different tasks while holding a depth. Tasks can be air share, lift bag deployment, light deployment, etc. The more you dive, the better your bouyancy will get. Try to adjust your weighting, and not just the amount of weight but the placement as well. You'll find it will help your trim. Practice with different amounts of air in your tank as well, as that will have an effect on your bouyancy.
Shane
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