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Yeah, the thing that you noticed with the ridgeline slack to when you got in is what makes the tarp saggy. tightening at least one end to the tree (an unmoveable anchor point) will help lots.

I...

Have you tried shifting more diagonal, so your head and feet go closer to the hammock side tie-outs?

Tie the tarp ropes below the hammock suspension for a closer tarp-hammock relationship. :)
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about the tarp- you are tying it to trees, right, not the built in HH tarp clips?

have a look at www.tothewoods.net - JustJeff (a member here) has lots of tips.

about the comfort: how tall...