EZ-ups and other shades do love to sail off in the wind, with disastrous results. I live in the southern Calif, Inland Empire, home of the Santa Ana winds....it's not windy until it's over 60mph
First line of defence, don't use straight stakes, go with lag bolts, at least 6" long, use a socket and speed wrench to twist into the ground.
If the winds do spring up and threaten to take off with your shade, lower the legs on the windword side, the resulting wedge shape, will go a long way in keeping the shade on the ground. trying to take a shade down once the wind has found you, can be dangerous.
If high winds are forecasted, don't put a shade up in the first place.
Oh, I like the ratchet strap idea, could be a life-saver if winds come up in the middle of the night.