I just did that on my Cafe I had 2 sets of 3 blades Mirage 23P and would hit 5050 (rev limiter from what I read) with 2000 502 Mag MPI's and 2000 Bravo One's, speed was 64.8 MPH GPS.
Tried 4 blade labed Spinelli's 24P from "cowlis" and hit 67.4MPH GPS still reved 5000. Bought them from him then and there! I concluded it was underproped, and BTW I am no expert, this is just my experience.
Boat 1994 Cigarette 35' Cafe Racer 10,000# no mods.
I noticed that the drives seem to run hotter (more oil in drive oil expansion tank) but I have received my fathers day present in the for of Simrek Drive showers that I will install tomorrow. I can keep you posted if you care Sling.