Hi Kartracer,
I just started to track my RT4 (still in break in period) but I also felt it was to soft and sat/rolled in the turns too much/long. I switched out to higher rate springs (based on weights and coilover angles) recently and my next trackday is on 10 July (so we'll see). I only do HPDE stuff (no racing experience) so not pushing as hard as you in a SCCA race environment.
https://youtu.be/D99GtOHTzQU?t=227