Did you try the passenger seat, to see if something is wrong with your seat?
I find these seats very comfortable, especially compared to other BMW seats I've owned.
I don't know if you've adjusted the seat back, but if you roll the seat all the way back, it will adjust/pitch the back upwards. I assumed this was due to clearance issues----- but you can force the seat to tilt back again. Before I realized this, the head rest was pushing into my head and the whole geometry seemed off.. Very uncomfortable. Maybe this is your issue?
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