Not trying to step on anybodies toes but this is what I do for a living I have propped more than twenty thousand boats in the years I have been doing this.There may very well be something wrong with the motor.But until the Op can get the rpms up where they belong the boat will never perform correctly.Now that may mean two different props for different tasks.Sometimes it works out that way.I always recommend taking the boat out with your normal load and propping it for that load.On some boats a hydrofoil can be detrimental to the handling or even dangerous in a few cases.And it is always hard on the anti cavitation plates.I weld dozens up each year from the extra strain.
