Do you set departure time? I believe it delays the charging. If the car knows it will leave in 8 hours it won't charge in 6, it goes slower. I notice it with 3.7kW charging too (scharging at a rate of 2.4kW for example).
The only difference I noticed is that in every trip my recuperation score is more than doubled! I always got 1 to 2 kWh/100km now I get 5kWh/100km!! True or bug? I also notice that the car slows down much less when I leave the acceleration pedal than before. But that might come from bad service...