I don't use full engine power either. with the m510 i used pass 2 and sometimes pass3. with bosch i use tour+. The thing that bothers me the most about Bafang is the motor, which does not have a power boost depending on the pedaling power. it's more on-off. and the worst is the loss of power as the battery voltage drops! there is no such thing with bosch, the same power at 100% is the same at 20% battery and at 10%. with bafang, the power is lost little by little, and then the cuttoff is 20 or 30%, depending on the firmware. the big advantage of bafang is the open system and DIY possibility.Same using but completely different philosopie. may be better fuctioning ? but your are only the tenant of your buying. During warranty in case of any failure you need to return your bike to the dealer and wait for motor standard exchange. After warranty you need to purchase another bike, nothing spare parts available, same the dealer have not the right to open the motor.
Personally i 'm satified since 3 years by the motor functioning for my use on high mountain, the motor is just an help to up the toy to playing downhill (i never use the max power), i'm not a racer to need more, especially no more functions.
And i'm fully enjoy to could doing has i want with my motor and to be the only one who build and maintin my bike. Good pleasure with your comon bike.