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Hi, I recently bought a 99 232 Gulfstream with a 250hp Yamaha OX66 that runs great except it won't stay on plane below 4100 RPM. It has no problem turning 5400 RPM. It came with a SS 15-1/4" X 17" prop. It also has a spare 15-1/4"x 15" aluminum prop that I installed but it didn't seem to make...