[Putershark]

I would try one of these
http://www.propulse.se/english/index.html

till you get the pitch set correct for your hull and loading condations then go to a metal prop (though I really don't see the need) after you find the right combo.

Then install one of these to help get you on a plane faster...

http://www.bobsmachine.com/Products/...stabilizer.cfm

Hope this helps?

Dave