The CJH is not, in my opinion, a good choice for a big guy. I'm "only" 6-0, and find it too narrow.
I agree with Brute, that tablecloth hammock offers more comfort for dollar spent than anything else out there, and will give you a truer sense of what you can expect from hammocks in general.
I don't understand your aversion to putting something under your knees. Many, maybe even most, of us do that routinely. Dead simple, and it works.