Kahuna - Bojapete has the same setup as you have.
There is also an article in the literature section.
http://www.classicseacraft.com/broch...cle/index.html
That boat was turning a 15x21.
I spent (wasted) a great deal of time trying different props on my boat. I ended up with a Mercury Mirage 19pitch . . .
Two props I recommend are the Mercury Mirage plus or Highfive. Try the 19 pitch and find a Mercury Dealer that will let you try before you buy. Ebay is also a good option b/c you can find some very good deals ($200 - $250 for either prop).