so you have static settings on your shocks, so no adjustability there....
with your current setup, you can't go too stiff on the front bar because you will begin to get push....
If you do not want to change springs or torsion bars, you may end up having to use a stock rear bar to help front rear balance...
that way you can stiffen the front bar a bit more and still not get push since you have added a bit more stiffness in the rear with a stock bar.
I am considering doing the same with my car, if I can't dial mine up with my Koni adjustables.
post a few of your AX pics. The cars roll more than you think even with bigger torsion bars and sway bars....you may not be that far off right now.