XRAY - Model racing cars

Hi guys.
Advice please setup for carpet tracks with medium traction and a lot of slow corners and one fast. Track size 30x17m.
Here's an old video, but the track is almost the same
https://www.youtube.com/watch?v=QEPLSLfeV2c

I would be happy to take the advice of all the hot guys ))

Have a look at my setups for Newbury (tighter corners) and EWS;

I have questions. I would be very grateful for an explanation.
Do you use shock oil brand Xray?
Why 450? Usually, team drivers use 300 - 350 -400 with 4 hole in pistone.
Why ackermann shim 0, as fast track, and the technicality?
Why rear diff position is down?
Why you you do not use graphite arms?
Why do you use foam inserts in the shocks?
please explain what the impact of these items and what you achieved these changes relative to the standard setup?

how to increase speed in turn?
How to increase the oversteer in the middle of corner