If you want make car more free in rear , rise rear roll center to 0.8mm , it make turn quicker, but less stability. if you want to increase med to end steering , remove front roll center shims to 0mm and rear keep 0.5mm.

Why so large track with in the front?
It make car more steering in our car.

3 or 4 hole pistons?
1.1mm 3 hole original 2015 piston

What does your front track width measure with your setup?
Track width Front 188mm , Rear 183.5mm