How about trying a 447.
You will likely see speeds less that what the speed calc gives you due to the size and bulk of the boat. While you are probably using a 25% slip in the calc, the superstructure of your boat will make a fair bit of extra wind resistance over a race hull, this will cause the boat to run slower than you think it should, in effect greater prop slippage. Plus wind and chop will play their part.
NZMPBA 2013, 2016 Open Electric Champion. NZMPBA 2016 P Offshore Champion.
2016 SUHA Q Sport Hydro Hi Points Champion.
BOPMPBC Open Mono, Open Electric Champion.
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