The smallest gap I can get between my Ultegra 8050 DI2 FD cage and my big chain ring teeth (50 tooth ring) is between 3.7-4mm. It is my understanding the Shimano spec is 1-3mm. The FD mount bracket riveted on the seat tube is a couple of MM too high and the FD is mounted as low as it can go. Should I be worried about this? The FD seems to shift okay and I haven't had any dropped chain issues so far. The frame is used by some Pro Teams which I would imagine run 50/34 cranks at times. So I am wondering how this would be considered normal.