ORIGINAL: early in
When I bowhunt in Alberta I always have my UA top and bottoms. Then I use Polar Tech (Cabela's) over that. AWESOME combination! I also bring a whole box (30)of those Grabber hand warmers for the week. I put 3 of them in my hand muffand one in each boot to keep the feet warm and toasty. If you don't dress properly you will NOT sit very long.
I have the same kinda system you do....and I only hunt NJ in the dead of winter, lol. I'm a VERY-easily cold person The cabelas polar tech works great!!!
In addition, I like those therapy back wraps you can get at CVS. A pack of 2 costs about $5, and they make you so much more comfortable. I also have a pair of Cabelas Pac-boots...they're made for arctic hunters, and they cost well over $100 but I'd never wear another boot in the cold again. My friends laugh at me for wearing those huge boots in a tree, but after 4 hours in the stand they are all out of the tree and frozen, while I'm just getting started. (the boots make it a little hard to climb on ladders and with climbers especially. But they're worth it)