There's a trick that Tony Rice does that I wouldn't have thought a probable solution. He puts the capo directly on the fret -- not right behind it as most people do. I didn't think it would work until I tried it. I thought it would have a muting affect on the strings. It doesn't seem to.

I also agree with heavier gauge strings -- they bend less. With some types of capos, and various ways in which we put them on, we bend the strings to the side. The Shubb is excellent, but because it hinges on one side, it is a very likely candidate for this type of string bending.

...or maybe it's because it's a short-scale guitar :^)