If you're using a post with more setback than the Thomson and your saddle is already jammed as far back as it will go, forget it. You need a different post. Various models of Easton and FSA offer tons.

You do not want to jack around with saddle position to make a seatpost work. If you do, the next posts you'll be making will be asking for advice on how to fix your knee pain.

I use the Thomson on one bike and it works fine. But then, I don't need much. I don't particularly like the looks of it but the frame had an oddball seat tube diameter and it was the only choice. It would not be my first choice for a standard 27.2 bike.