I've had my DN for about a month now and I keep my ridge line around 87 inches, but still fine tuning. I'm 5'10" and 230 lbs.
When you say swinging your legs around, how do you lay in your hammock? I like to lay feet left, head right. I sit down on the left side of my hammock then I just lean back and lift up my feet and lay them into place, there is not really much rotation to get in and out. I don't even really lift my feet to get out, I just slide them to the left and over the side of the hammock. No knees to the chin situation. However, if I got in on the other side of the hammock, that would be a totally different story.