If I feel like it's not moving, and the screw on the balance remover is getting tough to turn, I'll give the end of the screw a good wack with a hammer. That's usually enough to jar it free.
The only thing I use wd-40 for is displace water and build up a paraffin coating. I don't know if any penetrator would would work on a press fit. If I was going to try anything I'd use Gibbs or Kroil.
LG