Last year, I tried a couple but for some reasons never really committed.
For the past few days, I've been trying them and cannot stop myself from trying them during my sessions.
It seems like I'm not committing my front arm enough and not getting the pull needed to rotate before landing again.

A few examples:
I find body position not too bad, the front arm just need to be straighter and the sail doesn't have sufficient power to pull.



Here arms are fine but body and sail are leaning too far back.



So next the nose digs in, the sail loads up and ...



...smack!