P:NW's numbers are just under what the Monday scripted shows got. Which is surprising given the Sat timeslot. But those Saturday night movies typically get close to 2 million viewers. It's a wonder the network left both shows there as long as they did.
When Defiance ended, it might have been prudent to move them over to Mondays, but since both shows had already been canceled before airing here, perhaps Syfy felt it wouldn't be worth the trouble.