I have a classic cc with a 15hp 4stroke yamaha. It's currently running with a 9 1/4 x 11 alluminum. When I fish alone I am able to get the rpms up to 5400 and a speed of 21 with an SE200 stabilizer. When I fish with a second person I can't get the rpms over 4900 @ 16mph. I know the SE200 slows me down a little, but how can I gain back those rpms? 9.5x13?