Well, Mickey Thompson finally got the size rear tires I have been asking for (29x15x20) in the new SR Radials produced so I got them from them and then went ahead and made some new one-off wheels for the car. This set up not only looks much better, not really so pro-street anymore, but also lets the car work better as I was able to readjust the coilover setup on the rear and change the stance of the car.
I am now running 20x12 in the rear and 18x7 in the front with Mickey Thompson SR radials front and rear.