"Conduit SL Bivy" - Review of Mountain Hardwear Conduit SL Bivy

I used this bivy on a 6 day hike over New Year break in the Smoky Mtn Natl Park. I stayed in shelters (required), but wanted protection from weather if I got stuck out on the AT. Two nights it was bitter cold (0 degrees) and the condensation from my breath caused my neck and head to become very wet. I contacted the Conduit company to see if I did anything incorrectly in using their product - no response. The Backcountry chat expert said this is a typical problem with bivies and the only solution is to keep your head outside the bivy. My soulution was to take the bivy off my bag and not use it when I had to cover my head due to the cold. It seems to me if you have to stick your head out of the bivy in the rain it would allow water to enter unless you put a small tarp over your head. I'm debating on returning it.
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