It sounds like an effective way to fix the problem. One question I have on your repair is whether or not you plugged the vent holes in the pylons. They allow water to drain out of the hull plugs and prevent pressure build up inside the hulls.

I felt the movement in the hulls at the stanchions when I was sailing but couldn't when I had the boat home and raised up. I tightened the tramp to see if that eliminates some of the movement next time I sail. (There hasn't been much wind here in the southeast this summer).

Howard