TM2: Uncontrollable slide

[Kusal]

I race at the Kampenhout track (astro high grip).
When I accelerate out of a corner, the rear steps out violently.
It's a standard TM2.
F: long link, no spacers, std piston, 30w, medium spring, top middle, bottom inner, staggered rib
R: long link, std piston, 25w, medium spring, top middle, bottom inner, mini spike, 2000w dif
My TC02C also slides but more controllable!
I am looking for a bit more stability!
Would the 30 degene caster blocks or -1 degree rear hubs help in solving this issue?
Or schould I have a look at anti squat and droop?
Any other suggestions?
Motor is an 8,5.
Thanks