If I'm right, that is the same hull as the 2001 Wakesetter LSV that I had. The key to getting a good wake out of that boat is the Wedge (which it probably doesn't have) and a lot of weight in the rear. People used to complain about a flat wake from that hull, but mine was an absolute monster.
I would confirm that I have the hull right, and see if you can add the wedge. If the wedge can't be added, I would look for any Wakesetter 21 or 23.