Little update, I took my hammock to a local park and set it up there between some trees and the situation was the same, I think whats happening is the hammock is just conforming to the curves of my body, my knees being the highest point. Putting something under my knees completely gets rid of the gap and I feel instant warmth, it's kind of a band-aid fix and isn't as comfortable but it works. Maybe in the future I'll spend more time messing with angles and stuff because I did notice the hammock had a different feel when hung from trees.