RE: make it faster?
I like what was said about making changes to the radio box set up. I would have taken it further still and moved the whole radio into the cockpit area and installed the fuel tank(s) under the deck(s) beside the engine to lighten up the back end even further. With a boat of this size, the CG needs to be within 1" of the sponson transom to keep it on the water. Sharpening up the sponson runners would be a benefit as well