Lumpy old curves on these things! I am surprised how good they feel on the road, I test rode a 2010 model and the power delivery felt quite linear, as does my '08 model.
I see it filled in the 3k dip quite nicely and improved a bit across the range, be interested to see if fuel consumption is affected.
Also the way power commanders work means the computer may be wrong as the injector duration is altered after the BMW ECU has sent out signals, so if the fuel useage is measured by the ECU it will now be wrong.