I ran that boat with a 28 labbed 4 blade and was bumping the 6k rev limit @94/95 mph at mead!!!!
so far i've learned the more blades the more bite, the more bite the more drive repair, something for nothing doesn't apply here
Stick with the bravo 4 blade. Try a 30p and if is a bit much on top, you can get it labbed to fit your need. It should be a bit faster than the 5 on top also.
Darrell.