engine speed. At higher speed it is still vibrating more than before the clutch job, but at higher speed it is less horrible. The real bad times are fast idle (when the nob is all the way up) in neutral when the engine is warm and during acceleration. I have to turn the fast idle down a lot and then the vibrations drop dramatically (when warm).

Since the crankshaft, the front hub, and the flywheel are originally balanced as a unit, the balance will be impaired if the flywheel is re-installed in other than the original position on the crank.
The imbalance will be felt as a function of engine speed.