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@jadias
What you CAN do with down, though, is use it as a second insulating piece if it's really cold but you've been working hard.
When I climb in the winter I work up a sweat, but when I stop to belay my buddy up, I chill. Down is very effective but threatened by moisture. So instead of packing one fat down jacket or one fat synthetic, I pack a thin layer of each. Synthetic (Primaloft) goes on first, then if it's cold enough, down over that. Synthetic largely protects the down from my moisture and I get the benefits of both in a scaleable system.
Not sure how applicable that is to after cycling though...