In the high-speed camera shots, your release looks more like a full-roller.
Also, way way way way way too much flexion in the elbow on release. It looks like you're trying to create power and revs by straightening the elbow, rather that loading/unloading at the wrist. That type of release will tend to make your speed and revs more variable than is ideal, not to mention that you increase the chance of tendonitis in your elbow.
You also look like you're hitting the ball pretty firmly at the point fo release, which leaves you nowhere to go if you need more hook.
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Reporting from England