In fairness to blahness, I have seen him start out a little defensive and then come around. I guess when you think you have corrected something and then hear from someone that someone thinks it is still a problem, you might get caught off guard.
In fairness to JustAlt, I was wondering why blahness sounded so defensive as well. But, it is hard to hear constructive criticism so, as long as the stuff settles in right and the important information helps, then everything is good.
The video of Zhang Jike is a great example of the backswing. If you watch Jike's racket on his backswing, you can always see, at least part of his racket on the right side of his right leg.
If you watch your first video, blahness, especially towards the end of the video, on your backswing you can see your racket come out from behind your back to the left of your body. It does not happen all the time, and the camera angle is different. But your racket is always behind your body even if it does not come all the way out to the left side of your body. Zhang Jike's is always a little to the right of his body.
The result of this is part of the issue. Your contact is late. If you pause the video on contact, your forearm is parallel to the back edge of the table and your racket is in line with your body. If you pause the video of Zhang Jike on contact, there is one shot where he catches the ball late and his racket is in line with his body. In that shot he is obviously off balance. In all the other shots his racket is closer to the table than his body on contact and his forearm is at an angle to the back edge of the table.
I would say, a shorter backswing is a good idea and contacting the ball earlier is as well.
The person who coaches me told me my backswing was too big, and that my backswing should be more out to the right side than back. It is hard to change this. But it makes recovery much easier and it makes contacting the ball earlier much easier as well.
Hope this helps. You are doing a great job making those corrections one correction at a time blahness.