B16 Seat Post - Loose -Slop when tightened

Hi all,
I have a Felt B16 and after I took it to my LBS I noticed there was a small amount of movement in my seat post forward and back. I’ve tried tightening, lossening and re-tightening the post but it still rocks a bit forwad and back. After some research I saw some folks complaining about tgeir B16 posts too tight from too much paste. Is there some kind of seat post paste I need to tighten mine up? Thanks!

Carbon paste keeps carbon posts from slowly slipping over time but that’s not the issue here. Posts should not have any rocking movement when tightened. Its hard to say what’s going on without pics.