I got my boat up to 46 knots. V20 cuddy with three sided enclosure, radar arch,etc. The boat runs fastest in a bay chop. I just installed a Yamaha Saltwater Series II 15.25x19 SDS prop. It shifts like butter and holds water all the way to full trim.
That should be right on target...and really flying along. Big prop but if you're getting full rpm's it can handle it.