Fuel tank replacement

[Briguy]

I recently repowered my '78 SeaCraft with Twin 115hp Suzuki 4 strokes. The power package is fuel efficeient and quick.(2.6mpg at 4200rpm 27kts @10 1/2 gph)(38 kt top end)
My problem is the transom is a little heavy. For now, I moved my batteries under the super console and that helped a little. My idea is to drop fuel capacity from about 150 gal to 100 gal thus shortening the tank by about 2 3/4 feet. This would move weight out of the stern and shift the fuel tank center of gravity forward. i am also going to redo my deck scuppers so they rest at the waterline or above. Any thoughts on the success of my idea before I get started?