Dave, I put a 10 degree back bevel on a Stanley iron in a Stanley #4, which I keep set up just for difficult grain. This effectively gives me a 55 degree frog. Bear in mind that the higher the angle, the harder the plane becomes to push. Skewing makes for an easier push, but also lowers the effective angle, and may increase tear out a bit. As Bill said, the sharper the better. As for the wax, I always wax my plane soles, and have never seen a problem with finishing.
If you're not part of the solution, you're part of the precipitate.