I agree with you, before we buy a prop we are going to get a jack plate and maybe a trim and tilt, we want to get the best out of this prop before switching props if we hit 6200rpms then that's are limit to switch props because that's when our rev limiter kicks in. I don't really know what else to do to the engine besides the tuner idea I said, cleaning up the lower unit, and timing to maybe 33 degrees. any more ideas??