I use the orig JH tarp and I find that it covers well and if I knew there was going to be rain with gusts expected, I would 1) Choose a site with natural wind protection. 2) Be very wary of surrounding trees for possible "Widow makers" 3) Lower the tarp height and elevate the hammock position so there was more of the diamond surface to cover it. Another thing you might do is lower (Stake closer) to the tarp on the windward side and "Double stake" its guy line. Lastly, make sure you have a means to direct the water off the hammock suspension (Drip lines) away from the hammock.
"Take me away to a quiet place where beings melt into inner space. Every step brings me closer to see, my haven away beneath the trees." From Beneath the Trees by Everett Dort