I have a 13oz 5yd, and I'm pretty self-conscious when the wind is up. I find it flips a little easier than I'm comfortable with.
Same here. My 4-yard 11-oz (PV) kilt can easily get blown up higher than I care for it to. And in fact it has, once or twice in gusty weather. It's not an issue when standing out in the open. But if you're next to a building the wind is doing something other than straight-line shear, it's an issue.

Maybe more yardage with deeper pleats overlapping would help, I dunno. But it has a completely different feel than my 8-yard 16-ounce tank. As much as I like my PV casual lightweight kilt, it does feel like a skirt when I put it on, now that I'm used to wearing the tank. When I wear my lightweight kilt, I'm very much more self-conscious about how much the fabric blows around compared to heavier wool.