A buddy has a 1756 Alumacraft semi-v w/ an '07 90/65 Yamaha. He plows water really bad at faster speeds. When he is cruising at what we are guessing is 4200 rpms (no Tach) the boat is on step and goes well. When he pushes the rpms up the front end plows the water something fierce. We have tried messing with the weight distribution and trimming the motor. Trimming helps a smidge but not much, you best be wearing rain gear. Any ideas on what the problem is?