my rig is a 58cm, and measures 58cm top tube, center to center with fairly standard 73.5 degree angle. i have an all ultegra set-up. my silver ultegra seatpost weighs ~300gm's. anyone have any experience with a thompson setback? will it give me more options?

also, stupid question. with my present set-up if i put my seat all the way back on its rails it tilts downward a bit. am i missing the obvious here?