I used a 4" curve on BridgeZilla #1. I got in it a few time before I put the bug net on. I always get a sence of falling when I set down in it. My spread ratio is much higher then yours, around 1.43 I think. But just me picturing it in my head I see a banana shape. Here is my reasoning. With a shallower curve if gives you more material in the middle (duh Jason) which causes your side suspension to be farther away from your body. I think when you lay in the hammock it will of course pull the sides closer too you causing the center of the hammock to be lower than the head and foot end that is pulled tight with a 1.15 spreader ratio. Oh big run on. Sort of like tighter the head and foot and wider the center less the flat lay.
Unless you pulled it tight like dbl said previous. Not sure how much it would help but it might.
Sorry for the rambling but it's Sunday morning and my son kicked me out my bed.
Yosemite Sam: Are you trying to make me look a fool?
Bugs: You don't need me to make you look like a fool.
Yosemite Sam: Yer deerrrnnn right I don't!