BeachsideF30, it seems that this is specific issue only related to F30's series, F15s do have completely different AC hoses locations.
In the meanwhile, I have measured the EWG adjustment values via ISTA+. It says mine is about -0.52mm, which is just below the normal values range -0.5mm to 0.5mm (the picture below is not mine). Will manually readjust the wastegate valve link length tomorrow.
P.S. Found a set of turbocharger tests in ISTA, during the test did hear the buzzing wastegate link noise that everybody complains on since E90 with N54
Pretty quiet and barely noticeable but still present on N55. BMW is BMW
