I think OL mentioned that he did not think the silver plating made a difference, only the strand thickness. See his post #447 in the Oshpark Projects thread.
17 strand is a low strand count compared to regular silicone noodle wire, so definitely thicker.
EDIT: clearly Ouchyfoot said 19, not 17 - still a low strand count, so still thick strands. BTW nice work on all aspects of this light Ouchyfoot!