I just switched from my STI set-up to Barcons. My FD is always creeping back to the inside, or towards the inner ring. It shifts great. But after a minute or so I can hear the inner right piece of the cage rubbing the chain. It does this on all 3 rings. I've fiddled with the limit screws and am at a point where I need advice. I have to constatly readjust the lever to push the cage outside away from the chain. I have an Ultegra triple set-up with Dura Ace bar-end shifters on my aero bars. Is this common? Is it a limit screw problem?