thx for the tip. the chemical packs worked well...but i had to put several in a lobster shell to work...so my fingers weren't frozen. plus, with all the packs in and liner and outer glove, including the shell were a bit clunky. hard to shift well. i still use chemical packs in the shoes...since i still need help there. i did get a pair of Specialized winter boots this year and they have been great. best winter shoe i've had so far. i've had the Sidi winter, the Lake winter, the Mavic winter boots, but the last pair has been great (with chem packs. i used chem packs in the others as well...but never worked out well).
I hope you find a solution that's good for you.
You obviously know the drill .... keep the core warm, good shoes, etc.
I also have found that really warm drinks in a Camelbak insulated bottle are awesome. I often use a Cytomax apple drink -- it's like an apple cider when you drink it hot, so the taste is pretty good.
I'll have to check out those Specialized winter shoes. I use the Sidi winter boots with three layers of socks: thin wicking sock, thin neoprene and medium wool on top of it all.