Raced past weekend in Ingolstadt at "old style carpet" with more floaty overall grip. For this reason we tested some new approaches. See the setup attached.
The main change was the use of PSS in front and rear.
ST69-25 in front and ST69-15 in rear.
By using these screws over the ST69-00 i adjusted the spring stiffnes slightly, by 0.4mm softer.
The car got more "stable" feeling and was less floaty on the track. Not really faster, just more easy to handle.

I am not sure how this will work on other carpet types, but its worth a try.