I have the Grace Solo in spinnaker. I would go pitch it with some pics, but we just got some fresh snow in Boston, so it'll have to wait! :-)
I was doing a bit different from that video by staking my corners out before inserting the poles. That made placing the stakes a guess game. Maybe inserting the pole first will help. I've only set up the tarp 3 times or so, all in a park, because I got it towards the end of the last season and was graced with good weather for my last trips.