I have been playing around with the front roll center a little bit as well.
When I was running 3 degrees of kick-up, I ran .5's down on the front and 0's in the rear for the upper arm roll center. I did this to prevent binding according the article in the Tips n Tricks forum.
I went back to 4 degrees of kick-up and I went back to 1's up for front roll center. The car feels a little bit more balanced and secure in the corners now. I am running 17 degrees of caster (total - so 16 at the hubs) and with the front roll center back to 1's up it feels a bit more stable in corners. The front was grabbing a little bit too much in the corners with the lower roll center and high caster position.
Sorry if this is a bit confusing but its the best way i can explain it.
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