Sounds to me like you're having an issue with the wires rotating. The IGUS "Energy Chain" is more of a linear solution (
http://www.igus.com/wpck/default.asp...nr=4236&C=US&L) I don't know how well it would work in your application. Something more along the lines of a slip ring is what your looking for. Not sure if that sort of thing is legal though, you'll have to check the rules.