XRAY - Model racing cars

Hello Alex and all guys.
I drive Nt1'11, I'd said we have low traction track.
Main problem - at corner entry, after breaking - rear of my car rotates very much, it's very difficult to keep car.
Am I right - I need to lower outerart of rear upper arm?
Anything else works very good, under acceleration car drive very good and predictable.
I'm using 35-37 tyres without additive

reduce your car steering EPA. if this does not works, check your car ride height, diff oil setting. if everything ok, maybe your car front or rear arm did not travel up and down very well.

just my 2cents.

i think it's probably because arm movement