Dennis will help you out. I've got probably the exact boat setup that you're looking at. He helped me out when I first got it. It will
give you an awesome wave once you set it up right.
Off the top of my head though:
I think what you're doing wrong is the surf tabs. Those kill the wave if not set right. I believe I had mine set so that there were 3 lines lit up for the tab opposite of the side you're surfing on. The other tab has no lines lit.
That will give you the best height:length ratio. You'll be able to ride waaaaaaaaaay back and pull airs as well.
I had a Supra before as well. An '06 22SSV. Get rid of it, you'll get what you need in that 237