XRAY - Model racing cars

Would like to seek advice from here: bought T3 2012 recently, built and ran it for the first time today. Found the rear end of the car swinging almost at every corners (during the mid-corner and corner exit stages).

Here is my setup: xform/index.php?act=view&ID=57&setup=t3_2012

The day was cold and the track was pretty dusty. I've applied tyre additive + Tyre warmer for 30 minutes before each run. During the first few laps, everything was perfect and soon the condition I've mentioned above happened and made the driving being painful. Have I done something wrong or setup the car in the wrong way?

u can try -0,75 rear lower susp. holders
r2 hole in clamps (rear) or even r3
5,5 rear downstop
2 deg of camber everywhere
spool
2,6 rear spring
300 oil
700 diff oil
more rear toe in
in position in rear sway bar (or put them off [fr and re])
softer tires

this should help

Thanks for the advice. Just one simple question: Which one should I go first among all the changes in the list? Thanks!

-0,75 rear roll center pieces

Thanks! Will try it out soon.