It’s more involved, but if you can put bungee cord on your guy lines, it might reduce wind flap. The challenge is, if the wind is too strong, it might snap a cord. So the next “step” is to back up your shock-cord with fixed line. In my case, I have about 6-8 inches of doubled shock- cord (cord is tied in a loop). I stretched it out to get a sense of its limit, then attached it to the end of my fixed guy line and the tarp D-ring, with the other end tied to the fixed line at a length about 80% of that maximum stretch. So the cord will stretch, but the fixed guy line keeps it from stretching too much and if it snaps, the fixed guy line is still attached (but would need adjusting).
The stretch in the tarp lines minimizes “flap” and also allows the tarp to spill some wind load and spring back.
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