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I would check if my hips are flexible enough to allow having my knees so close together. You can check that out doing the pop up as you did in the beginning of the video, but way slower. If you find out that you are using a lot of strength in your inner hips muscles to do that, it's probably good to improve your hips mobility. That's what actually happens to me, stiff hips

rotated left hand will flare your left shoulder out and create more space for your front leg to pass through. This can be super exaggerated on a quick right hand wave where you want tuck your left shoulder down towards the wave face.

Try folding your front leg under you more. Left knee would go towards the right rail. You can also rotate your left hand so your thumb points more back towards you. This will help rotate your shoulders when you pop up.