Lawn darts
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I tend to have the same problem, especially early on in a descent.
For a stable descent you want to be as much like a lawn dart as possible. That is, your centre of mass should be well ahead of your centre of lateral resistance. As Erik and Peter say, neck (or wrist) weights would help if you're not in an AIDA style competition.
When I first dove with Eric he had an inventive system where he would let his weight belt slide up his chest for descent. He soon abandoned the idea though.
Bigger fins might help to shift the centre of lateral resistance backwards but I haven't experimented much with different fin sizes to say.
My own solution is to kick very gently to maintain a vertical position until I descend further. As my lungs compress and I drop faster, my centre of lateral resistance shifts backwards and descent becomes more stable for the rest of the descent.
Tom
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