No, air in the feet doesn't solve the problem, it only masks it. Trim can be achieved in any set up. I got mrmccoy trimmed out with his bottom heavy Asahi HP100s in a wet suit.
Jax, you need to tell your boss to let you get some time off!
Jax, you need to tell your boss to let you get some time off!

Rob doesn't know it, but he'll be much happier if I'm in a drysuit . . . .