Roger:
Begining in 1941, almost all bomber crews said they were attacked by yellow-nosed 109s or 190s. The legend of the "yellow-nosed boys of Abbeville" was being built. These were the "toughest" Luftwaffe fighter pilots. After all, who wants to say they were attacked by just average fighter pilots?
By December 1944, almost all fancy decorations were gone from Luftwaffe fighters save colored bands on the rear fuselage. Many had done away with all unit insignia. An order in July 1944 directed that all fighter units paint their spinners black with a white spiral stripe. By in large this was done, although erratically in the middle of intense combat operations over Normandy and the retreat into the Reich. Ground crews did not have a chance to do this all at once. Some were still one color, maybe green 70 and others varied in style.
Photos of JG 3 and JG 27 at the time show they complied with this. I have not seen one with what could be interpreted to be a yellow nose or spinner.