T&T: Should I Repitch Prop?

[Bob/Myrna Siegel]

Vessel=36' Marine Trader sundeck
Engine= Single Perkins 130 HP (NA)
RPM (measured by photo tach) WOT in gear=2450=77% of WOT in neutral
RPM(measured by photo-tach) WOT in neutral=3170
Vessel cruises @7.3 kts
Detect slight vibration at rear, suspect prop needs balancing.  If prop is
removed for any reason, do you think it would be wise to repitch it or keep it
as is?
Bob Siegel  "Shalom" Annapolis