I recently got an eno dn hammock, using the eno slap straps and been trying to hang in my backyard between two trees which span 20' apart. Seems every time I hang I'm forced to cross my legs as that's is the only way to be semi comfortable. Also doesn't feel like I can get a flat lie in the dn. I used the hammock calculator and entered in all the info to get recommended measurements. Am I doing something wrong or is this normal?