MHes - 8:31 am on Mar 15, 2007 (gmt 0)

>It's like a glass ceiling somewhere around #50. Anyone else experience that?

I think this penalty is an on/off switch. I would guess you have escaped the filter.... but trashed your ranking ability in the process. If you have gone the route of diluting normal seo for a specific phrase, then this would be the inevitable result.