If I'm following right, your main goal is to keep the tree attacment points lower, without sagging to the ground.... My suggestion is 2 carabiners, attached to the long ratchet [slackline] (1.5 or 2 inches would be stouter..), with Marlinspike hitches; you could tie these in at the desired ridgeline length for your ENO, then just clip in, ratchet tight, then hope you don't pull the trees down on you!
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