I spent most of the night experimenting with "swing" weight in the rear. It was pretty dramatic how it affected the car, but it's also something that will need adjusting with changing track conditions. I did try putting shims under the ball studs (AT21) and thought the car was worse. Lazier and more prone to rolling. Gonna try some AT21s (-.5mm) next time, especially with this new batch of tires that feel like 24s.