How is it at shutdown????????? Does it dig the nose? Does it turn right or left? Thats one of the main things that you need to find out when testing with those kinds of speeds. You will get 50% of the peeps that run a backcut and the other 50% run tapered hardware. 1/8 above keel is rule of thumb to start. You should drill and tap your suction for a guage. That will get you a better idea where you need to be Im glad to hear that you finally got her out there You did a hell of a job on that boat.....