I have been having some poor shifting in the front lately, and during the investigation, I took a look at the guide to make sure it was not gunked up. It did not look bad, but I put a little lube in the groove the cables run in. However, the FD cable seems to be rubbing right on the paint just past the end of the guide. The guide is a purplish color, which the internet indicates is a standard shimano cable guide. Is there a cable guide that has a longer groove for the FD cable so I can a) keep the cable from wearing through the paint down to the metal, and possibly improve shifting?