I still face a lot of problem with overheating the PEM and reduced charging current. The reason is dirt. i got some tubes installed to make an emergency cleaning by pressured air possible. but it happened, that even my emergency plan stopped working. I had to go to the munic tesla store to get my PEM cleaned.
the only solution beside a liquid cooled PEM is air filtering or a redirection of the cooling air from the upper air inlets instead through the wheel housing.
With a working air filtering, the original blower combination may work as well.