I noticed a little bit of understeer a while back when I lowerd my car to where it would almost be considered slammed. But I found that it was understeering because I couldnt get the back end to rotate, which in turn would cause loose front end grip and I had to back off entering a corner or getting on throttle sooner. So I ran less dampening adjustment (softened up) in the rear so it would roll a bit more and the understeer went away for the most part and I havent had any trouble after that.

As for traction rods. I got the SPL units and ran Epsteins mentioned 8" length and it made a huge difference in cornering. It felt like the car would roll a bit more but it was much more stable and the rear didnt hop around over less than smooth surfaces like it did before and I could stay on the throttle all the way through a long sweeper or get on it so much more quickly in a turn.