I would strongly recommend against relying solely on a hex tarp for two people - when the wind gets blowing, you will NOT be able to batten it down as well as you could over a single hammock. You will want the protection of the extra coverage.
Suck up the extra weight and either carry two tarps or a larger tarp than the MJ. I'm sure you can get someone to make you a proper two-person tarp out of spinn.
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