Watching the video I seem to see these things,
1. Dropping of the shoulder. Indication of not enough Knee bend usually.
2. Drift of 3 to 4 boards left in approach from stance to slide. We should walk at our target.
3. Slide foot turning at foul line, sometimes parallel to it. Common for bowlers that like to kick that other leg clear to the side instead of it following behind them as they slide . This also causes the hips to open which causes the shoulders to open then as well.
While these things do not answer the question directly, they can all impact our release and any of these are easy adjustments.
Looking good

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