That upward angle was perfect for achieving a very tight pitch all along that back flap and vastly improving breathability. So in summary, the keys to a very tight pitch are:
1] Main center trekking pole needs to be raised as high as the tent will allow.
2] Tie out the ends
3] Tie out the back flap at an upperward angle to your second trekking pole (or car in my case
NEMO customer Randy M. wanted to share a tip for pitching Meta 1P. When car camping, he ties off the back vent to his car door handle (similar to tying off to a trekking pole). We all agree; that is one of the best pitches of that tent we’ve seen. He says: