Replace your stove with a alcohol stove and that will help I use a 3/4 leangth thermarest in case I have to go to ground. It gives me extra warmth in the hammock also! You can make a insultex sock to go over your air pad that will give you 20°some more warmth if you use 4 layers of insultex. Your pack might be weight also! I use a BG Gorilla pack it still has an internal frame but the whole pack only weighs 1.5 lbs. I hope this helps!
High ground is dry ground!