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the wire springs are anti-rattle clips. one could argue that even an minute amount of beneficial tension is going to help the anti-drag cause, but my money bets the anti rattle spring's contribution is insignificant.
i think the best contribution one could make with reducing drag is making sure all pins and sliders are lubed to allow free movment of the floating caliper.
also... one more thing to consider is the parking brake adjustment of rear disc brakes.
On a ZX2 for example, behind an access bolt on the rear of the caliper, an allen set screw exists that limits retraction of the caliper piston.
this is done so the parking brake cable mechanism has a reference upon which to pull against. one can use this allen screw adjustment to gain additional clearance between the pads, much like one would use a star wheel adjuster on drum brakes.
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