You might have the cable so tight that the shifter can't swing far enough to reach its outermost trim click.
As a fact-finding step, hit the downshift blade on the shifter until it's in the full-inboard position, then unclamp the cable at the FD, let a little slack into it, and clamp it again. It should be just a little relaxed. Now give the upshift lever a mini-click (the trim position for the inner chainring) and the FD cage should move over just a little. So far, so good. Now try upshifting to the big ring and see if you have both of the big-ring positions available (the trimmed-inwards and trimmed-outwards ones), and whether the shifter will pull the derailleur all the way to the limit screw.
Any good? Oh, and also confirm that your shift cable is routed through the derailleur's clamp correctly... if it's around the wrong side of the bolt and/or the aluminum "shelf" on the derailleur's arm, that'll mess up the actuation. The cable should come up, over the top of the "shelf," and over the top of the bolt, laying in the groove that you'll see if you remove the clamp bolt and washer.
Last edited by mechBgon; 06-15-08 at 06:46 PM.