When I assemble the MM2, I LAP the plate and discs with 1000 grit, and run a small file around the damper post and inside of the discs where they fit around the post to reduce any stiction. It works well enough out of the bag, but I have found that this small process can help free up any flashing from the molding process and improve the consistency of the damping. I do the same treatment on the plates of the carbon and FRP damper. The machined discs don't need to be lapped, but molded discs like the 3racing or r246 should be.
Scuffing the plates also make it more consistent when using lube with the discs. I mostly run the discs dry, unless the track is particularly bumpy.
when I install a disc on the post without a spring, I want it to drop to the base of the post without stiction or slop. The discs will loosen with use, so I usually err on the side of stiction over slop.