After 20 hours of pink noise going into the PXs, and them doing some stretch exercises every evening now, things seem to be slightly changing. Still not comfortable, but now I can survive one and a half hours commuting time in the morning and in the evening, with an additional 1-2 hours listening time in the office. I hope it is going to be improving more. Sound signature became a bit smoother at the mids, and a bit stronger at the bass, but still detailed and good to listen to. It's now really only about the comfort for me, nothing else. I am not as patient as I should be I guess, but I really want to like them in every aspects.
Tomorrow with 2 of my colleagues we are going to have a big headphone swap day. One of them has the QC35 mark 2s, the other has the B&O H6s. I'm looking forward to seeing the outcome of it.