I have been vaping for over 2 weeks now (and loving it) with a few sets of M401's, both auto and manuals. I just received a new set of attys and seem to be having an issue with them. The are "working" in that I am getting more vapor from them than from my original set but I am not getting a thought hit at all. Is there a logical reason for this or is it I just need to work them out for a few days. Thank you in advance for your advise.