Hello, and welcome!
I assume you bored the big "dump hole" in the transom out as well?
As a slight tangent thought, are there signs of any repairs on the underside of the hull near the treansom? Mine developed an unnerving list at speed until I took the antifouling off and found a repair near the transom - just not a partcicularly good one, so one side was slightly convex, the other concave! Only became a problem above about 22 knots.