For the cold winters, I would suggest using the NGK BKR6E instead. Ive read that the 7E's can cause some issues on cold startups, and I think I am having the same deal and I live in Cali!! The BKR6Es are similar in price to the 7E I usually purchase mine from Rockauto.com. They are one heat range colder than stock, and worked pretty well on my 1 and 1+ setup.
Gap them to 0.28 because by the time you swtich them out, they will become somewhere around 0.32. WHich means if you kept it out 0.32 from the begining, you will experience a blowout ( which happened to me on stage 1!!!)