Hmmm. Form looks relatively good to me, though, as Tim points out, you do have a tendency to drop the bow arm, a movement that may be started before release. That would cause a consistent arrow placement issue, i.e., it could place the arrow a little low and left consistently, but that hasn't much to do with arrow flight itself.
I think in this case, your grip may be too loose. A completely loose grip is fine, if your bow is balanced so it doesn't move at the shot. Your bow has a tendency to twist left at the shot. Though most of that occurs as recoil to the shot, there may be enough of it occurring during the shot to affect arrow flight. Pressure on the grip looks pretty good to me, but again, as Tim notes, because of the loose grip, you may be grabbing the grip at release. Not sure that would affect arrow flight though because the arrow likely has cleared the bow before you grab, if that makes any sense.
Looks like you were paying particular attention to your form in the video. How did the arrows shoot? Better, perhaps?
Don't think we have it yet. Maybe others will see something I don't. What kind of erratic arrow flight are you getting, porpoising? fishtailing? corkscrewing?
OK. Just looked at the video again. Are you shooting a cushion plunger or adjustable side plate of one sort or another? If so, check the arrow alignment on the bow. Hang the bow vertically from a peg and with the arrow on the bow, the right tip of the arrow should just about touch the left side of the string when viewed from behind. If it bisects the string, or worse yet, is toward the right side of the string, that will almost always lead to erratic arrow flight when shot with fingers. Do this check regardless of what kind of side plate you have.
BTW, very quiet bow.