Prop experts tell me what to do!
 

I am planning on doing some testing w/ BBlades since I am about 40 mins away from them but I want to run my numbers by to see if I am going in the right direction. Boat currently has a Mirage Plus 27P and runs 65 @ 4800-5000 (this was on less then perfect super calm lake, no chop) Motor is a whippled 454 MAG B1 1.36 gear (i think) What would be my prop slip # and what other props fit my setup, looking for more speed, I have added some wieght to the boat via stereo and 1 more battery, last owner had seen 73.9.

Your slip is super high, 28-31%

On a boat like that, slip should be way lower. I think something is wrong, but not shure what.