Prop Slip increase with speed.
 

Has anyone experienced increasing prop slip with increasing speed. I have an '89 Formula 292 with the old blunt nose bravo lowers. I think they switched to the new high speed cases in '90. Either way my prop numbers drop to about 55 MPH which are 11%, then they begin to increase up to 16% at 66-67 mph. I have run both Bravo and Hydro props and both do the same thing. I'm thinking about swapping out the old cases with the newer style. Anyone think that these old blunt cases are increasing my slip numbers?

All of my other boats have always had better slip the faster I go, this is the first time I have experience this.