Any way to get more caster adjustment without newer adjustable CA?

Yup. Positive. Spec is -2.0 to +3.0, more positive being better. Some people say up to 5 degrees is sometimes necessary. I can get mine to zero, but that's all the adjustment I can get. It tracks pretty well, and I don't know if I'll tear it apart again this year, but I think I want to get it a little better. It will track better in panic situations or handling situations that way as well.

Yeah you put -3 in your original post that's why I asked.

You probably won't get more than +3 degrees of caster even with the offset bushings, but that's usually enough for most applications. If you want more than +3 degrees of caster you'll probably need tubular UCA's. The more you run the more stable it will be, but if you run much more then +3 degrees of caster you'll probably want power steering as it will raise your steering effort as well.