Yup..if the arrow is not straight to begin with your SOL.[:'(]

Make sure that the nock and point ends of the carbons are as square as you can get them, then use a slow setting glue (epoxy, powerbond) install inserts with the broadheads you want to use, and use an arrow spinner of some sort to adjust the insert 'til they spin straight.

Do the same thing if you are using uni-bushings in the back end for nocks.

And make sure you are buying straight arrows in the first place.