22 x 18 Nibral Dyna Quad. I get an honest 17 kt at 2500 RPM. Top RPM is 2850.
I am not rigged for tuna or chartering so I think I might be a bit (lot) lighter then you.
It had a DQX when I got it and I could only get 2700 RPM at top. I still got 17 kt at 2500 w/that prop.
Hope this helps.