Yes, car is driven during the winter.
Tapping lightly on the back of the aluminum portion of the hub did absolutely nothing last time. I would have had to really hit it hard to get it to budge. I'm worried doing that would damage the wheel bearings.
Are you guys suggesting really putting my arm into it and hitting the hub hard from the back? A friend suggested back the screws out about 1/8" or so and hitting those with a hammer. At least if that got it to move, I'd have a surface to pry on from the front.
Interesting that they come off so easy for everyone else. Lovely Iowa winters. I can't even get a brake rotor off without using a bolt on the face of the rotor from the back side and forcing it off. Rubber mallets, ballpeen hammers, and 4lb dead blow hammers had no affect.