I have a zero offset Origin8 2-bolt seatpost, nominal diameter 25.8mm, measured diameter 28mm. It works, but the saddle is slammed as far back as the rails will allow. An offset post would probably be better. I've fiddled with seat angle, and the last post that I had was a 1-bolt offset that none of the notches were the right angle. I think I need 20/25mm offset, infinite adjust, 25.8mm seatpost, but that's not turning up anything. What should I be looking for?