Never heard of a Di2 microadjust on the front DR, only the back. After alignment and height are adjusted you just set the Low limit (while in the little ring front, big cog back) and the high limit (big ring front and little cog back).3. After that, you do have a way to micro-adjust the FD precisely so as to remove chain rub in the auto-trim feature. You activate it by first shifting into the big-big combo, and then holding down the button on junction A. The buttons set to move the FD will then microadjust so that you can eliminate any chain rub.