narrowing down prop choice

Boat-2002 X-star with 310 HP TBI. Current prop=13.25x16 ACME
ballast=400's in the locker, KGB, and integrated bow sac~1500lbs total?
people=any where from 4-8
Riding= 90% wakeboarding at 21-23ish depending on who's riding and ballast weight
some wakeskating with empty ballast
a rare surf session if the lake is blown out or crazy busy with boats

Done some reading of the archives here and other sites.
I think I have it narrowed down to the OJ edge 14.25x14 or the 14.25x 14.5

My current prop does OK. A little sluggish out of the whole. With 7 or 8 people and full ballast, I'd say really sluggish out of the whole. I'm guessing the difference wih the bigger prop would be a little less hole shot but a little more top end? How much more top end? I rarely pull a salolom skiier, I think twice since I owned the boat. We normally don't have to do long runs to get to good water. Ride a relatively smaller lake and river. Suggestions?