Hi Azapa,
With your lung capacity, you are a prime candidate for exhale diving. Half lung would cut approximately 3.5 kg off your surface buoyancy but add only 1.2 kg at 20 m. The descent becomes an almost effortless static(you might have to kick once or twice) and the ascent is only slightly harder than what you are doing now. It might even feel easier because your legs will be fresh when you start up.
If the idea appeals to you, search: exhale diving, FRC, Sebastian Murat, and similar. Read every post in the long threads(yeah, it will take a while). Exhale diving is a little tricky and doesn't work for all kinds of diving, so load up on knowledge and go slow.
Let us know how you solve your problem.
Connor
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