I have the Stg.3 and the mono ball kit. Been rocking the -2.2 for over 2 years now and have had no unusual inside wear and wish I had more camber for the track and found the springs to provide a softer/nicer ride than stock. The monoball kit really tightened up the steering and made it much more communicative. I think what your feeling in terms of added NVH or it being "too much for a DD"
is derived from the monoball not the suspension. I personally love it but my car sees a bunch of track time and my wife DD's it to work everyday