F.
Send me a PM with the following info.
Year of motor. Prop you are turning. Engine height, trim setting when the chine walking starts. RPM's at that setting, weight i.e. tournament load or half gas and empty except for yourself. Are you reading speed of of speedometer or GPS?
I run a 99 518 VX with a 200 E on the back. Good hull even with an average set up.
J.E.