625hp, 675tq, 150 ratio, was running 850hp, 130ratio bmaxs turning 28 figure since the gear change it should pull those also.

Big step? Staggered? If so, 28P should be too small. 575sci boats came with 32P Bravo Ones from Fountain. That should be close to where you need to be, maybe even a little small.

If the boat is a side by side and/or small steps, 28-30P should be closer.