I saw this thread but don't have time to read the posts. I toured Wisconsin with one of the very first Quallofil bags, 1975. I was 6'1/2' tall and bought the considerably lighter regular bag for up to 6'. Way cold the first night. (Below freezing, October in Wisconsin.) Wore all my clothes the next and started paying real attention to fluffing the bag every time I moved. It worked and I slept well.
My touring philosophy for clothes is simple. If on the coldest, most miserable time of my tour I was not wearing everything I brought, I brought too much. Granted I am older now and like a higher level of pamper but my legs complain more than they used to if I go to far in that direction.
Ben