There's no changing pinion angle or trac-bars with this car, it's independent rear suspension on coilovers (9k front, 6k rear rates aka stiff).

We started with 12psi in the drag radials, went to 15psi, down to 11psi, back to 15psi, up to 17psi, up to 20psi...none seemed to make much of a difference. When we were in the lower psi range the burnout was only leaving marks on the outer edges of the tire, so we bumped up the pressure until the entire middle (where the tire is more like a slick) was burning. It helped a bit but not much.
For traction it seems like our only option is going to be running slicks, which is what we thought we ordered, but there was a mix up so we decided to just try these anyway.

Thanks for the thoughts though....everything helps at this point haha.