@fsonicsmith , The Funk Firm Achromat is as good as a mat gets without resorting to marketing BS which in the case of Sublima is of the highest order in comical proportion.
@deadhead1000 , as a Phil Zone addict I encourage you to try the Achromat.
In addition to the mat you should use a good reflex clamp like The Sota or Michell.
Using both the mat and clamp will improve pitch variation by flattening the record to the platter and removing minor warping. This is something you will most definitely notice.