Going at it all wrong. Now get a 2500 motor and run 3S which gives you 27,000 rpm with a 432 metal prop with watercooling and a 60 amper esc,watercooled. This way motor,esc run cooler. small kv and higher voltage. I'd beefup the boat especially where m/mount is by laying 1/32" plywood the size of 6" x 6" as upgrading motor will have more torque . I'd use 1 3S lipo and place it in front of motor and have CG at 30%.