Sweet! Love the "Yeah" at 4.15 hahahahaha!
Looks pretty smooth there, interesting angle too, cheers for posting.
Even though the kite mounts make the rider so far away, I think it'd be sweet if you had three GoPro's running at the same time. One over the shoulder, one on top of harness hook & a kite mount, them intercut b/w the three cam's back in the edit suite.
It's pretty easy to sync up three cams, just need to clap them in to begin with, then sync up in post and intercut b/w best angle at each "Yeah" time.

Great work with the backpack mount, i'm still a bit suss on the safety side of that one though, but cheers for posting. Would love to see pics if avail.