What prop are you running on your Max

We only surf and I don’t care about WOT top speed I would like to get better fuel economy I believe the prop I have is more suited for high elevation. Boat has all kinds of power

2019 max

Stock ballast plus a 400 # fat sac in each midship

Usually 2-6 adults

Prop is a 15x13 wake pro

Surfing rpm is 3200-3500

Elevation is 1100 ft

That sounds about ideal.
13 is a pretty low pitch prop meant for high torque while sacrificing top end.
32-3500 is good on the RPM's

I doubt you'll get better economy from changing props that one is pretty well suited for surfing.