I also purshased a Bosch Mixer after reading great things about it in connection with making traditional bread. The machine is very powerful and really works the dough. I do not know enough yet, or done enough experimenting to be sure, but I think the machine is so aggressive with the dough that it overheats the dough, which, I understand, is not a good thing, especially for a neopolitan dough.
One thing I have done is to hook the machine up to a "dimmer switch" that you would otherwise plug a lamp into. The idea was to slow the machine down , as even its lowest speed seems pretty fast to me. The dimmer has worked very well, and I let it work the dough for about 2 minutes before I finish with a hand knead. Again, I am no expert for sure, but wanted to pass this thought along as you experiment with the mixer.