Not that I've noticed. It rarely gets driven on the street but when the street tires are on its smooth.
I think you are fine with doing anything you want with the diff mounts. But when you put aluminum subframe mounts on then it gets rough and you can hear everything in the rear.
95lx on tccoa got all of Siskas old stuff and I rode in the car at carlisle and it is rough and you can hear the detroit locker doing everything. My car is smooth compared to his.
Not sure how the DLF subframe mounts affect ride.
Hope you can make it out to carlisle. Whole bunch of different stuff out there to take in.