Getting prop info here unless you are talking to people that have similar boats to yours is going to be worthless.
Brett at BBlades is going to be your best advice or someone that races BIG boats WITH surface drives.

Prop slip on a big heavy boat is better for the drives than low numbers. More so on boats that have the drives buried.

Bigger diameter and littler pitch usually works the best, as long as the stern lift is a constant, prop diameter below the hull plane creating horizontal thrust and prop diameter above the hull plane creating vertical stern lift.

Thanks for all the info. I tracked down some 1" spacers. I'm going to try some 34 pitch 17" 5 blades as soon as I can and then if the slip is still higher than I like ill throw the spacers in it. I honestly don't care much about slip I just don't want it blowing out the props at 100 in smooth water.

I didn't think you wanted to try spacers.
But, for future reference, we make billet aluminum spacer plates and we have a test program so you can try them without have to purchase them. We make them in 1/4" increments.

I don't think we ever actually heard what the actual depth of your prop shaft below the bottom of the boat is. Also, what is your rpm and speed at WOT? Let's get a actual slip #.

Brett

Not enough diameter.

I went back and saw the prop shafts are 1.5" above the bottom.I believe the spacers are going to help quite a bit. 17-17.5" is plenty of diameter for what I believe to be a 42 Fountain.
Still would like to hear some actual performance numbers.

Brett

You have spacers for Ssm 4's? Or are you thinking he has 6's?

Stepped 42 fountain doesn't need as much diameter as big heavy cig.

Oops, I have #6's.

Thank you,
Brett