FWIW, 3 year update on my Di2 triple implementation (
referenced in the Santana thread above). Not a single problem and shifts great!
As a quick summary, ours was a special case of trying to install the Di2 triple FD to work with a non-mtb chainline, ie: single bike road triple chainline setup, not the typical wider tandem triple that situates the chainrings further outboard. My install involved hacking a Di2 mount to move the FD inboard, right up against our stoker seatpost which allowed sufficient inward FD movement to utilize the full triple functionality, not limited to just 2 chainrings (we ran a double ring setup for a few years but decided the triple was our preference as it allowed using a closer ratio cassette on the road tandem). As we are using only a 48t big ring, there is no need to tilt the FD per the above "Santana" shim method.
Good luck with yours!