Insulation while on the move is an issue, too...that's why I have some synthetic breathable layers - particularly my Patagonia Nano Air hoody and my Arcteryx Atom SL (for warmer days but a great layer). And you can get them for WAY cheaper than the hunting brands. Mostly being layered over so who cares if they're bright blue??
I get sweaty, so I need breathable if I'm moving and that Nano Air hoody is the bomb for warmth/breathability. I, too, have a Cerium down hoodie and it's pretty great for what it is - great to layer under a shell, for sure. But not nearly as breathable if I'm moving hard and fast.