Ok... I'm not sayin' I can help, but after tearing my bike seatpost/etc apart today and dremmelling/greasing it after having it slip pretty badly, I might be able to point some things out...

first off, I took the seat post out of the frame, and unscrewed the bolt keeping the micro-adjust clamp (seat sandwich) in place. Set bolt aside on a paper towel (not DP's clean dish towel!) and lifted seat off post.

The aluminum micro-adjust ribs (teeth?) were all mashed flat. After scrubbing well with dish soap and a toothbrush (not hers) I put the engraving bit on my jewelry dremel and re-grooved the ribs. Not perfect, but not smooth, either.

Then I scrubbed it again (trying to avoid those abrasive aluminum shavings) and put grease in the teeth (just a light layer) , a little on the post and on the screw, screwed everything back into place (would've taken a trial ride to see where my sit-bones stuck; on trying it this evening, the seat seemed to be between my sitbones, hence my discomfort, but whatev) but it was 107 by the time I was working on it and closer to 110 when I had to put the hot ol' uniform on and go to work...

Aside from the dremmelling, I hope that all helped. I'd grease all of those contact points, just to be sure.