Usually when you don't have enough throw, you've not allowed enough of a gap so the CA hinge can flex. Many times you can just "exercise" the hinge a little past the throws you expect and get them to loosen up a little. When I install my CA hinges, I put two T-pins along the centerline of each hinge to keep them aligned properly while gluing. The thickness of the T-pins also forces a gap that is usually just right to allow for good flex range of the CA hinges.

EDIT: My T-pin method differs from the article Bruce posted in that I use TWO T-pins along the centerline to keep the hinges from rotating, AND I leave the T-pins in when applying CA glue, so that a small gap is forced by them. After the glue dries, you just twist the T-pins (to break the CA bonded to them) and they pull right out.