It is best to have a plug cutter. Every ball is different. On my press, even at 0-0, some balls will be off so adjust accordingly. I take the cutter to the ball and adjust the table so that there are no gaps.
When using a router, which I have very little experience with, I texted it the same as the plug cutter, adjusting from ball to ball. Resurfacing is the choice of the bowler. I use grill screen to clean up the plug work and have a set of abralon pads to smooth out the work. I'll then take the ball to box.