I have a Devinci 2012 road bike, bought new. I like the bike and it's running fine, but from the start has had a noisy drivechain, which is basically chain rub, I think. Mix of Shimano components (Ultegra rear derailleur, Tiagra front) and microshifting. I find microshifting a bit fussy and thought that might be the problem. Had it tuned a half dozen times. Mechanic where I bought it said things might need to 'settle' (!?) Front derailleur seems to rub in the lowest gear, or when it's been tuned to address the problem, at the other end of the spectrum, the highest gear. Could it be that this mix of components (stock with the bike) just doesn't quite line up right? Could microshifting be part of the problem? Not interfering with the fun of riding, but would be nice to smooth out.