Did you buy the bike recently from a local bike shop? They may be able to help you dial in your saddle adjustment.

But, assuming that the bike is the correct size, or that you're stuck with this one for a while, can you clarify whether your current seatpost is a zero setback seat post? generally, most seatposts ARE the setback type, like pictured a couple of posts ago. A zero setback one would look like this:

It would be straight the whole way.

For a setback seatpost, you might look at the one that Velo orange sells: http://store.velo-orange.com/index.p...g-setback.html
This has a larger setback than most seatposts.

BUT...you may also want to double-check the angle on the saddle. Are you also feeling like you always have to slide back to get on the widest part of the saddle. If that were the case, it might man your saddle was pointed down to much. Make sure your saddle is totally level as a starting point in your adjustments. To check level, place a hardcover book on the saddle lengthwise, and then place a level on the book.