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I would first play with spring tension. go to a junkyard and swipe 2 extra springs. See if you can wind and/or cut one tighter, and make the other one looser and see how it goes. while its apart or better off the car blast that thing off inside and out with carb cleaner. Gotta eliminate all variables here. Next would be to modify the geometry as the guy above said, ovalling out the cam the throttle cable rides inside. by doing this you are effectivly making the cable longer which the slack needs to be taken up somewhere.
Is this something that has always been a nuisance or only when trying to "featherfoot?" Your cable could be worn but usually they wear the other way around, where you have to press more to get the car to open up, then all of a sudden it does, which is double trouble for your mpg's. Extra response off idle is what happens when a TB is too large. I'd hate to suggest corking up the pipe right before the tb entrance because you could lose regular performance.
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