I have a DIY 12'x10.5', and what I find is that coverage depends on how deep the catenary cut is on the vertical sides closest to your heads. The reason -- being side by side, you're both not in the middle, so you actually only get a portion the tarps length, then that is reduced more when there is a cat-cut.
I typically don't have a problem with a 12', but I could see a 11' tarp with deep cat-cuts being a problem, especially in any weather that comes at an angle.
-dbass
Wife and I use a Hennessy Hex no issues thus far.
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