Bryon, I've spoken with Bryon Greene the web designer of Wakeboard Indiana quite a bit in the last few weekends. He has the 22 foot Supra and claims that all he needs to do to get a good wake starboard wake is to fill the starboard tank. A good starboard wake can be difficult to make. He invited me to ride with him after a surfing event this weekend, but I had to get home.
I wakeboarded behind a Launch 21 V at the NWL Ohio State Championship in Dayton a two weeks ago, the 21 V Launch wakeboarding wake was amazing.
Are there different Supra ballast options, which do you have and how much weight is in each tank?
I would try increasing the speed of your boat or if you have a Bennett trim tab, I’d set it lower (down). Either of these two changes will lift the back of the boat up out of the water and should lengthen the wake. You might also try putting a little more weight in the bow (move people forward) or putting a little LESS ballast in the port locker.
Good luck let us know how it turns out.