Double post eh?
http://www.bikeforums.net/showthread...9#post14300639
No, You need to Turn the saddle over.. and look
It is more about the length of the support rails straight parallel section,
extending further into the nose of the saddle offers the ability
to adjust for more setback.

Or you look for a different seat post with more set back
due to the design of the upper portion of the part.
when the saddle will not shove back far enough on the rails.