23 Inboard prop

[clb33fyxj]

Hey All,
I was wondering if anyone had any input and direct experience on 3 vs 4 blade on the 23 inboard. Boat has a 330mpi crusader and currently runs what looks like a 16x15 3 blade repitched from 17", probably the original bronze wheel. Definitely turns over rated rpm. Spec is minimum 4800 with 5000 preferred. It turns at least 5000. Im looking for some better efficiency at cruise and while loaded which I think a 4 blade would give but dont have experience with these hulls as inboards.
Thanks!