Is there no thumb hole in that ball? The guys that I know that throw thumbless (including a teammate of mine) still have thumb holes drilled in the ball.
It definitely seems like you are trying too hard with your arm to get the ball to spin and not getting enough hand in it. There is a guy in my Monday league that throws identical to your video, house ball, low at the line, etc. his ball looks the same going down the lane, barely any movement to the ball.
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