Dump those link wires and get yourself some straddle cables. I'd also suggest using Problem Solvers Wide Cable Carriers: http://problemsolversbike.com/produc..._cable_carrier. I put a small reflector bracket or similar item under the straddle cable to catch it and prevent it fouling the tire if the main cable should part.
Also make sure that your cable housing ends are ground or filed flat and that proper metal ferrules are installed where appropriate. Don't concern yourself too much with the return spring tension; as long as the pad does not drag on the rim you will be fine. Once you apply the brakes any imbalance will vanish.