I've already dropped mine down to 1/1,000 and seem to be picking up 95%+ for each LPR separate, including the new plates that I've seen. Now, how much of that is due to the street lights, driveway lights etc.. I don't know.
However it seems the new thing around here is, obviously stolen plates, but also people putting their plates in the back/front window, nullifying any ability to grab the plate.
With that happening, I may need to concentrate on getting my one camera to color 24/7.