Do the math and you see -2k body and -6k lead needs 8 litres of air for 10m neutrality (@ 63k I presume you aren't fat). That means 8k buoyancy on the surface (16l of air in suit and lungs) and -4k at 30m. At 20m and negative almost 3k you could sink almost 1,5 meters per second with any kind of streamlining. Something just doesn't add up.
Easy answer though. If you have trouble getting off the surface and no trouble getting up, try more weight. To convince your mind that it's OK you might want to take one kilo in each hand and dive in 20 meters. The D3 readout will tell you a lot and retrieving the weights one at a time will be good training.
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Aloha Bill
A man is wise, only to the extent that he is aware of his own ignorance. Bill Bonner '08
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