I would recommend going to an even 6kg 6kg or even 6kg , 7kg rear setup maybe even less rate if you want a softer ride like 4 4 or 5 5 but there is so little travel ud b bouncing off the bump stops in front. U will be sacrificing road comfort but it'll help how the car drives round corners
I would also recommend a progressive koni bump stop as an upgrade and if you can request more low speed compression damping. The BC racing basically have none of this so its slow to transition.