In water that cold I like a single colorado blade preferably attached to a short arm with a white/charteuse skirt with some blue strands on top. You can slow roll, yo yo or use some type of deep water stop and go. The single colorado will slow that bait down, keeping it in the strike zone longer and will be at it's best on a yo yo retrieve. I see no problem with you choice of line.
ww2farmer is right on point with the way a fish will bite a spinnerbait. It could be a bite where they darn near rip the rod out of you hands or as in the way I caught my PB, feel like you snagged. Last January I was fishing in Disney and the blades just stopped and didn't feel any weight...whatever the case is, when the spinnerbait doesn't feel right during your presentation, set the hook.
JMHO