Luke,
On a different note, after watching your video all the way through, I noticed your thumb way to close to the rim for what I would call a good solid power grip. This can also affect the nose of the disc on release causing nose up or nose known releases because the disc is moving in your hand as you pull it through.
Try moving your thumb off the rim about and 1″ or so, this will also automatically cock your wrist a bit more giving you some more rotation of the hand which can result in added spin..
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