So, thought I leave this here for anyone in the future looking for an answer.
I contacted EMG directly, but they were closed for thanksgiving, so only got a response back.
They told me, that the culprit in here would be MM pickup, rather than P.
Was advised to swap green and red cables on the MM connector. Using a needle you can release cable pins, swap places and connect back.
Out of phase issue is fixed and it was a fairly quick and simple thing to do (had to ask my wife to use her little fingers to swap the cables, hehe)
Attaching some pictures if explanation isn't clear enough. Picture 3 shows them using a screwdriver to flip the locking mechanism up.
Cheers!