Give it more time. I have read that it can take up to 72hrs. For it to start. I used a smack pack once with all of the same details you have given. It didn't swell as much as I thought , and it was closer to the end of the sell by date. It took a day and a half for mine to get going. You should...
I haven't done mead but want to try it this year. I usually cover my carboys with a grocery paper bag and that doesn't seem to affect my temps too greatly.
Just like Husker I did two cans as well in the mash. I didn't use rice hulls and never got a stuck sparge. It is still in the primary and smell awesome.
Just wanted to say that I brewed your recipe today and it came out awesome. All my numbers were spot on and the smell was heavenly. I figured I can't go wrong with this one since people are still talking about it almost three years later. Thank you sir!