I made some 6" mini bars from solid .5" aluminum for my GT Skeeterbeater UL. They make it much more liveable but it still has a fairly pronounced calf ridge. I tried them rigged several ways with different sags/tensions to find the best outcome. It's a great concept but I think that I'm just going to stick with a larger hammock for comfort. Maybe I'll rig them up on my much larger DIY rig. If that gets any more comfortable, I'm selling my bed!
If at first you don't succeed...
You're doing it wrong