Those revs are totally fine; the boat will run all day long at that.
The likely reason you're seeing a hop in revs is because the std prop on most all Wakesetters is circa 14.5 x 16 plus a little cup. The prop in your boat is well down in pitch, as much as 3-4". The axis boats were built with nothing but wakeboarding in mind with no provision for top speed.
I'd suggest that if you're worried about gas and don't need the extra hole shot you're getting from the current prop I'd switch to something along the lines of a 4 blade 14.5 x 16 prop. Also try and run light, don't fill ballast or drop the wedge until you really need to.
Hope that helps