FWIW, do not put any wet lube in the firing pin channel. The best thing to do is flush the channel with GunScrubber and then blow it out with compressed air. If you absolutely must lube the channel, use a dry lube such as dry graphite.
Too much lube in below freezing temp will often give you the problems you are experiencing. Same deal for the entire FCG. The rule of thumb is, if you can see the lube, you have used too much.