This is a 4 blade Turning-Point Hustler prop. It's the proper size and pitch for my outboard, but I'm getting these cavitation burns which are starting to pit quite deep. It's a Merc 60 Command Thrust and I run at 5860 RPM at WOT which is right in the sweet spot. 

 

I looked up cavitation burn patterns and I found an article and diagram that says this pattern is a result of "poor prop design". 

 

Looks like I have to do something, but I don't want to mount a different brand prop on just to have this happen again. 

 

Whoa! I’ve never seen that before, I hope you get it figured out