With the full-length housing for the BB7s and the 9 sp friction shifting system on the Matthews, I splurged and bought high end Dura Ace brake and derailleur wires, upon the advice of the shop that said they do make a difference. I haven't yet installed them yet, and can't pronounce on their efficacy, but the OP might want to consider such top end cable at least for his rear derailleur.
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