Yeah, I am worried about damage cause by cavitation but it pulls so hard my hand is sore by the end of the day and my wife can't even drive the boat. It's a 1972 Starcraft American with a hard left pull. I've played with adjusting the trim fin on the volvo penta outdrive but that only helped a little. Played with the trim, not much improvement either. It's a starter boat so I don't want to put a ton of money into it. I just ordered a set of Barrett spring trim tabs and see if maybe that might also help a little (at least get on plane faster and help with porpoising.