You are saying it isn't working. My question is what does not feel right?
If you are tall and trying to sleep on your side I am guessing that the hammock is pulling up on your feet and torso and tweeking for waist area. If this is a lot of it, then go with the longer hammock. Mine is 10 feet long and works good for me at 6'4". Try making a really long one and keep adjusting it until it feels right. A wider one might help too. Mine is the full width of the ripstop.
Is that too much to ask? Girls with frikkin' lasers on their heads?
The hanger formly known as "hammock engineer".