goose:

The flat section in the front does not have to be that wide. 1/4" will do. Also the very deep "V" in the front will act like a keel and make the airplane harder to steer on the water. If you use the same overall profile but make the "V" shallower and the flat section narrower, your floats will ride softer and steer better without loosing any floatation or spray protection.

Jim