Just curious. I have a stock Miyata 110 (12 speed) that runs perfectly. I can go big/big or small/small with no chain rub at all and I never have to trim the FD. It's flawless.

Then I have my Mandaric (14 speed) that I tinker with and tinker with and just can't get it right. Any big/big or small/small (even when not at extremes) causes some chain rub and I have to trim the FD going up and coming back down. I love the ride and don't really mind its quirks, I'm just trying to figure out if the issues are mine (not as mechanically inclined as I like to think) or if even the LBS would struggle to set it up to perform the way my Miyata does.

What's your experience?