The reason for why you are bending the hanger is independent of the level of maint required for Di2. I have an 11-speed Di2 on my bike and other than 1-2 times during the riding season (I live in the Boston area), the only maint I perform is to recharge the Di2 battery. While I have no need to make adjustments on how the Di2 system operates, you can adjust, configure and play with it as much as you want via the etube app which communicates to Di2 via Bluetooth.