With straight crank arms and FD's clearances are always tight. At best you play with the FD angle and height so when fully extended it clears the arms and the big ring. It's really finding a sweet spot. Also, if the rings are not running true, in this case the outer, then you can end up with extending the FD out further than if straight and possibly rubbing inside. Every crank is little different. The type of FD also plays into this as triple FD's with those inner contours can in some cases, rub against the inside when pedaling hard if not aligned perfectly(vertical and horizontal) or the rings have a certain amount of wobble. I have found those wobbles is not the rings, it's the crank mold itself. Double FD's don't have those inner contours so in such cases can work better. Yes, a typical Shimano/Suntour road double FD shifts triple rings too.
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