Ok so i have a 20 degree leighlo underquilt (which i wont mention just doesn't seem substantial enough to be that warm but we will see) and i cut a square off of a blue CCF pad. I also have a 30* sleeping bag as a top quilt that i have used before and am happy with. Basically, with this setup, would you be warm do in the 20s? obviously the right clothing will be key to get down to lower temps but i am thinking about a mid march start for an AT thru and i want to be warm at the beginning. I know temps can even get down to the teens so...i'm a little worried. I sleep hot and stuff and obviously this is a subjective thing but with these numbers and temperature ratings how would you do?