Last night I had the chance to go to the track alone. Did some effective testing....
I started out with 8 degree castor. That helped a lot.
Then I tried softning the rear, by making the shocks more laydown at the top. That was bad ! The rear end seemed to be every where else than it was supposed to, it slided out a lot. So I tried raising them instead. It was a step forward, but the car wasn't stable enough. So I set the shocks back in stock position.
Next thing was to stiffen up the chassis, by mounting a joint between lower and upper deck. Now it was closer to a controlled rear. I mounted another joint, now it was close, but the rear still wanted to slide out.
I mounted a front sway bar (stiffest), and the rear was tamed.
But somehow the car was unstable. Found out that a wheel was broken. Mounted some similar tires, but with harder inserts. The car was very good, but at first I felt quite understeering. Changed driving style (more throttle work) and the car was incredible fast. It now changes direction very quickly and yet it's very stable.
I got some nice Fukuyama packs, and the car is an insane driving machine now. Cant wait for the race on sunday....
Thanks for all your suggestions, it was good inspiration.
Schumacher Mi5 - Sanwa MT-4 / RX-462 / KO Propo PDS-2123 - Nosram 5600 X-treme Saddle Pack - LRP SPX Zero/X12 17,5 - Nosram Stealth Touch Evolution - MAAS SPS 9250