questions

I hae a 2000 Nitro 750NX w/Merc 90, hydraulic 5 1/2" setback jackplate and a 4 blade prop. Pitch is 20. I have heard that tuning or balancing a prop can get a few more mph. We dont have any one local that is good at this. What would it cost for the people at Prop Gods to do this? I dont have a...