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I've been using it on amsteel and no slippage so far so, figure I'm good. I am trying to come up with a slightly different way to do it for a second hammock that lets me have a shorter min distance...

If you put pressure on the bottom of a silnylon tarp that is wet you will rapidly find yourself wet too ;) . Separate lines are always used for tarp/hammock to prevent that, and add a little more...

Yeah, My current widest hang is 30ft with the tree straps at a little over head high. 35 ft takes them higher than I can reach, barely I just touch.
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I actually used alpine butterfly knots for my set-up that has 2 RLs. The upper/main one holds my tarp and then my hammock clips into the alpine butterflies via dutch biners to let me do a 30 degree...