you may actually need to raise the motor a little,any pad boat will walk when
you get them up and running,picture setting a v on a flat surface and try to keep it from tipping over.make sure your steering cables are adjusted,much play in them and you'll never drive it,that prop needs to go for best performance,if all is set up seat time is all that will fix it.make high speed runs and hold a little left hand pressure on the wheel,just enough to keep the hull in a slight turn if it starts to get away trim down til it quits and try again,those boats usually weren't hard to drive so just practice,with 200 i would suspect it was empty to get 72mph,it usually takes a good 225 to get 70 out of them with a laod.propshaft should be in the 4.25 below range to start and go up a 1\4 at time best height will be about 3.75 probably.