I'm not sure I understand the problem--if the cable's too tight, you need it to be longer. If that makes it rub on something, you might be able to route it a slightly different way, bring it out from under the tape a wrap earlier or later, or run it along a different part of the bar's circumference, in front rather than underneath or vice versa. I always have to mess with routing when I change things around, but there always seems to be a solution I can live with.