This shot is tricky to learn. This is a great explanation on how to execute it. Thx!

Good video especially part about not flicking wrist.

Great video!

Were you using the eastern grip?

What grip are you using! Semi-western or continental?

Is the paddle face open during contact and follow through?

Nice. Your stroke is way too long though. Finishing over your shoulder is fine when you have more distance between you and your opponent, but if the ball is intercepted, you will be caught off guard because your stroke isn't compact enough. The ideal shot would bring your paddle head at or close to your normal ready position, so you won't have to "reload" to counter a speed-up. All the best.

what grip?

Incomplete video. There are better ones out there.