NMs actually have 2 100 slots. one for white, and one they can drop on their own without white. There are plenty of pictures floating around of Dynamis NMs dropping 2 100 pieces after a white proc.
So getting white guarantees one 100 piece, but the other one is still effected by TH and such.
U dont need White Proc on NM's,they all can drop 100's,i got them w/o proc and TH. White Proc on normal mobs let them drop 100's, that is the only one reason u go in w/o sub,not for NM's.Try again and SS that^^