I muddled through the problem this weekend, when wind caused the ridge of my HH tarp to flutter and make noise. The solution was to tighten it up to the stakes, bringing it down onto the ridge line.
The two things I have not done well, and need to do well in future, is to make both the hammock tie-outs and the tarp tie-outs a whole lot tighter than I have done so far, before tightening up the hammock suspension.
"We must, indeed, all hang together or, most assuredly, we shall all hang separately." - Ben Franklin