I need advice. I'm trying to get a 10' Rigid (looks like an inftatable but is all fiberglass) to plane easier. The motor is a 2004 15hp 4 stroke Merc with trim and tilt. The boat is a side console with remote steering. The hull weighs 330# and my friend and his weigh 300#. I attached a tachometer and discovered that the upper RPM is around 4500 rpm. The motor is rated at 5500. The boat really struggles to plane with even me, by myself, at 250# The current prop is a 9"X11" stainless by Pro Tech. What aluminum prop do you guys recommend? I know the boat could use more horses, but really think the 15 should at least plane with two small people aboard. I don't know hwether to go down to a 10" or 9" pitch. Any and all advice will be appreciated.