I have the same year and model. I run a 26 trophy I ran the tempest but got the best numbers with trophy. The PIV does lie the motor low. The hull on these things doesnt ride high so your best numbers are most likely going to be jackplate low. Mine is setup with 26 Trophy medium sized plugs in all holes, plus the blowout ring on as well. My jackplate is about 3/8 in. from flush running touny load full of fuel two people 70.2 gps @ 5600 rpms. With the heat I am about 69.6 to 69.1 . your numbers will also be better as the water begins to cool. These Mercs dont really dig the heat. I hope this will help you but there will be much better advise given on this board as there always is. My numbers are going to be close to everyone else that is running the PIV. Sorry to be long winded but I forgot to say that the differnce between the trophy and tempest is that the trpohy tends to carry heavy load alot better allowing you to run more consistent in the rough stuff.Robbie WilmuthTuscaloosa,ALRoll Tide Roll !!!!