1970 Camaro Tri-4 bar issue

[TBART70]

http://www.artmorrison.com/instructions/tri4-bar1-Model.pdf








I need some help. I have this in my car, it drives well, except for the massive wheel hop. According to the last page of the link, the bars need to be in a certain plane, mine are not like that because of ride height. I can't go low enough to put the bars in the right places. My question is how would you move the bars, lower the front of the bars or raise the rear of them or both? I know I have to do it equal amounts to keep the geometry the same or close to the original design. Or am I missing something else causing the wheel hop, pinion angle, tires too hard, coil-over setting? any suggestions would be welcome. Can you see an easy way to modify the brackets without cutting it all apart? I would also like to put johnny joints in, Art Morrison makes the frames with them now.
Thanks.

-Tom