You're losing 60g with the carbon chassis so the rf brass hanger is a good place to add some weight back. Had the bushing on the bottom of the spindle for months thinking more steering and flipped them and I got more steering. I liked only 1mm shin for the front tower camber link too. No addtl high or low roll center parts I'm aware of. However the exited rear aluminum camber link mount is -2mm
FYI the xray aluminum rear roll center holder is also -2mm....same as the exotek.
Stripped 2 of them and lost 2 ball studs and shims in the process.... finally upgraded to the aluminum version.