Brett corrected my buddy's '97 290 Enticer cavitation problem on a set of 25" Mirage Plus 3-blades without doing a full lab finish on them. They were thinned and cupped but not thinned as much as a full lab finish. He has ran them for hundreds of hours with no problems. If your current props are dinged as you state, that is likely part of the problem. You would be surprised how much small imperfections in prop blades can affect a boat's performance.
By the way, I've seen many examples of thrown blades on stock Bravo I props on boats with moderate HP and conservative X's.