OK, so 3 season no doors. Get a 12' RL
I would not buy either tarp you listed.
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Hmmm, so with a WB Blackbird, which it looks like is a 10' hammock, which lets assume an 83% ridgeline (so 100 inches long), it sounds like the 10' option on the hammockgear cuben tarp with doors is better than the 11' option, since even the 10' tarp will still have 10" on each side excess tarp.
Does this sound right?