Yeah, ignore those directions on the bag. As far as I know, only one person on here has been able to make the directions work as advertised and I don't think even he was totally sold on it. A ridgeline actually would help, I suspect. The biggest problem with that tarp is the lack of a crisp ridge. No matter what you do, the ridge is floppy. By using a ridgeline you'd be able to get it pretty taut and you'd probably cut down a big chunk of the push-in from the wind.
Setting your tarp up in the dark is an art form. I've been doing it for years and there are mornings that I wake-up, get out of the hammock, look back at my tarp in the morning light, and just shake my head in shame. Luckily, I'm usually camped where others don't see it to document it. As they say, pictures or it didn't happen. Therefore, it never happened, so never mind.