Thanks for your information. Interesting and useful to see.
You mention that the Epic SL5 eliminates most condensation. Is that really correct?
My limited experience with double wall, non mesh tents, below 0F was in a 2 man 'mountaineering style' tent.
That tent suffered from a lot of condensation ,inside the inner tent.
I would imagine (with no experience ;-) that the much larger volume SL5, without the added warmth of the outer tent, would have a lot more condensation issues.
Also, my Epic windshirt, is one of the least breathable ones I have.
Is the fact that wind is blowing across the surface of the tent perhaps the reason for the high breathability you experienced?
PS, this is all just out of interest, as I am not going to buy a new tent! Just trying to decide which combo to use.