I don't know about that. Don't lose faith. My Deda was "rocking" too. A horrible noise. I got that fixed somehow but never got the posts to not slip. I'll bet I worked on those Deda posts for 15-20 hours all told, between taking the seat on and off, removing, cleaning, recleaning, retrying on the road, recleaning, trying alcohol, trying everything, even sanding the post very lightly to get the slippery finish off, gettting a brand new post, trying a new seat clamp...twice!, same efforts all over again... arrrrgghh!!! The Thompson worked from the first try. Not only that but it had a different, more positive feel as I tightened it.
I'm not saying you should go Thompson....only that I'd be wiling to bet it will work.
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