does anyone know how to figure prop slip. i just put this 225 opti on my 202 and i'm trying to get it set up right. i am still learning to drive this motor and need many more hours......but yesterday i was running full tournament load with 2 people and hit 73.6 mph gps. i have a 25 yamaha prop that has been worked and i was at 5800 rpm when i hit that speed. do you need anything else for prop slip. o yea my gear ratio is 1.75. thanks