Have you tried coding your suspension. I just recently had my '15 F80 coded with GTS EPS (Steering), CS EDC, GTS Differential, and CS MDM done. And the improvement is great, car is much more nimble and rebound is much better in Sport + mode and still comfort in comfort mode. The CS MDM though wow
, its almost like removing the traction control completely to a point, although there is a perfect balance of intervention and user control that allows you to just push the car like the way it should be pushed.
I would definitely try coding some suspension stuff as a mod if you havn't already..