I saw the same thing. You might not want to start the ball a full step earlier, but at least half a step. You shouldn't pull the ball back (which it doesn't look like you're doing too much), or through (which you are definitely doing).
The result of pulling the ball, aside from inconsistency, is that your hand comes around the side and on top of the ball early, which gives you a weak release. If you let the ball swing from your shoulder, with gravity providing the acceleration, you can keep your hand behind the ball in a strong position, with the fingers below the equator, which will give you a much more powerful release.
Once you get the timing and swing cleaned up, I'd also work on getting a little bit more knee bend. You have good balance, but the ball is too far above the lane at the point of release. Get your hips lower so that the ball is only an inch or 2 from the lane at the release.
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That my boy... that's pro quality.