> A 3" hole is actually cutting about 7" of material. a 4" hole is cutting
12 1/2+ inches.
It may be a bit late to implement this, but would it not be easier, less
irritating if a series of 1/2 or 3/4 inch holes were drilled within the
perimeter of the hole, and then a chisel used to knock off the resulting
spurs as needed?