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Notwithstanding Angry's suggestion, I'd look to see what the nominal gap is supposed to be and verify that you have that and not more (I bet Sheldon has the answer). Then I'd space the middle ring inward, pretty easy to try. I've run a LOT of miles with an older Sugino crank the AT, with triples and 9 speed barcons, on my Bob Jackson, and it's also how I have my wife's road bike set up, and I've never had this issue. Chainrings are TA from Peter White Cycles if that helps.
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