Single 1.1. It's all you need at your weight and I doubt will stretch much at all. So, from a comfort standpoint, you won't gain anything with the double IMO. If you want to use a pad, then the double layer is very handy. Pads work just as well in a single layer, it just isn't nearly as convenient.
There are reasons for that.
I have one of Warbonnet's Diamond Aysm tarps and like it. The only real issue I have with it is that to get a really tight pitch (which I like), you really need to use a full ridgeline with the tarp (which I don't like). If it doesn't bother you, if fact some folks prefer a full ridgeline, then it's a great tarp. It gives plenty of coverage with some fiddle room to spare and affords some nice views from the hammock. But, if weight isn't a concern, there are gobs of tarps out there for less than $15 at Walmart and the like that will serve their purpose quite well. Loud, heavy, and not pretty, but they will keep you dry.
Go all old school and use webbing and rings.
I've tried them all, but keep going back to the old standard. Very, very, very easy to use and a strong track record of reliability. Not the lightest, nor the heaviest option; they are somewhere in the middle. Like Goldilocks said, "Just right".
Good luck and have fun shopping!
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