Hello. 2019 23’ GSR pontoon with Yamaha F115 and Ultra Legs (Sea Legs). Stock white Yamaha 3 blade prop. Wide open throttle exactly right RPM’s (5,800ish) but never able to trim motor as prop catches air / cavitates. Will check motor mount position this week, but thinking that is the only option (see if motor can be lowered). It has been like this since purchased new. Top speed is 21 to 23 mph. Am I missing anything. Should I be able to trim motor. Maybe it is the sea leg weight? Thanks.