Fishdaddy;
If the coon are rubbing and going bad, I would just let them alone until next season. No use in skinning a coon that isn't worth taking to the fur buyer.
If you think the coon are still ok, try going to a good stout lure instead of bait that you are using. Even a fox lure with a little skunk in it should do the trick better than the bait. The bait in cold weather may be freezing and not allowing the smells get out into the air stream. A good lure will not freeze up nearly as easily and the calling power will be much above the bait.