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Eric,
You will find that understanding a little bit about aerodynamics and basic air flow will help you too.
If you have the wind-break closer to the mount you will have more success. At the distance you have it in your pics, you will get swirling air flow up and over the tarp and buffeting around where your mount is. If you can confine the area more, the current should flow right over the top and down the other perimeter wall.
Your best option is to surround the mount with a windbreak only about 1m either side of the mount. Height can be kept down to about the height of the top of your scope or if you want, 200-300mm higher, so you won't be blocking any sky that way.
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