I recently bought 35 zr with twin 525 xr drives side by side. It has a Bravo I 4 blade. I feel Like I should be getting some more top-end speed. Running about 75 WOT

That boat with that set up should run 92-94

Very often when one buys a boat it comes with the worst set of props the previous owner had, or even their buddy.

Give BBlades.com a call and get a recommendation, and see if they have some you can borrow.

That is off, my buddy with the same boat and stock 496HO ran 84 in the shootout a couple years ago.

At least tell us what props are on it..........

Sorry, it has 31 pitch. I thought I put that in the original post.

I was going to say 30 or 32's........is this a step bottom ?

That boat with 525's/XR's should have a set of 34p 4 blades.

Full throttle rpm, prop type, size and pitch, tab and trim setting from neutral will help a lot.