Nothing insulated breathes well. Truth told, in those cool conditions, nothing leather breathes much either. The insulation doesn't work near as well when it gets damp. Pac boots work so well in cold weather because the felted liners can be removed to better dry. Alternating felt liners works much better still.
I've had good luck in your conditions with 200-400 gram thinsulate boots sized to fit with heavy wool socks. Try to dry your boot insulation out overnight as best you can. Heavy wool socks will absorb a huge amount of moisture before they get clammy or lose warmth. A sock change brings back most of the insulation. It helps keep the boot insulation from damping out too.
Consider using a camp boot at night. It'll give your feet a rest and give your boots more time to dry out too.
You can also cut down on foot sweat with spray on anti-perspirant.
