There's a reason Moesly set up his 21, 20, 25 and 27' designs to be self bailing - as a Florida native, he knew that we can get 10-12" of rain in a few hours without even having a hurricane! Giving up that feature just because your motor is too heavy is fundamentally a bad idea IMHO. I'd rather move the console, batteries, and even the gas tank to correct the basic CG problem you're gonna have on plane, even with a big flotation bracket, and that would also help preserve self bailing as well. Depending on the batteries and bilge pump to keep the boat from sinking in a heavy rain is tempting Murphy! It's begging for trouble!
If you go with Don Herman's new bracket design and reroute the scuppers to go out the transom with the Raybud ping pong ball check valves, I think you'd be ok. You could even get clever and cross the scupper lines under the deck like Moesly did on some of his designs so the port scupper drains on stbd side and vice versa. That way a heavy person walking to the back corner of the boat gets to keep his feet dry!
