Na, the wet suit just makes it a bit more of a trick. In other words, trim can be adjusted to be perfect at depth, but it will vary somewhat at your safety stop when your BC is empty.
For the warm water weenies it is easy because the wetsuits are thin (or nothing).
My advice: don't run out and buy a drysuit unless you are cold.
By the way, I dive wet and use ordinary weights on the top tank strap on a Transpac II. Works like a charm. Your exact solution will depend on the BC you are using.
I have no way of knowing if the 20# of weight you use is optimal, but always try for less weight. My test is neutral bouyancy with no air in the BC on a safety stop at just below 10 feet with 500 to 800 psi left in the tank.