Now here is a video I filmed more then a year ago testing my new playing cue I've built and doing one of the standard drills I repeat almost every practice session warming up.
https://m.youtube.com/watch?v=GETwjn3MSZo
Now I have to come back to those times I played my best pool. At those times I felt pretty comfortable in my stance no matter what shot I was facing and everything seemed to work pretty natural. But once the problems appeared I started to notice I don't feel comfortable on certain shots any more losing my confidence and so on. I guess being younger I was more flexible and it was easier to find the comfortable body position. As I said it seemed and felt pretty natural but after those changes in my body when I got older it did not work any more that way. I started to realize I'm not comfortable on many shots and started to be too conscious about what and how I was doing. I felt I'm not comfortable on my backswing and very often it's not straight either of poor alighnment and as a result the hip of my back leg being on the way for the cue.
The biggest problem I noticed in my stance with the back leg bended on certain shots this leg straightened with my hip moving on my backswing. That mistake was the major reason for my cueing not being level and straight and that's why those long draw shots I loved to perform afterwards becoming a nightmare. Of course there were some other things I did not like but among many mistakes it is always a key mistake which leads to the others to come as a result. So you need first of all to find this key mistake and work to get rid of it.
After I looked at yourself closely from the side I understood – I need to work on my walking in and alignment plus to straighten and lock my back leg to make sure I don't move on the shots. I should also say that by teaching kids and observing them growing up and improving is also a great experience. Naturally talented kids are a very good example when it comes to their adaptability and flexibility.
After that simple change once I locked my back leg my accuracy started to improve noticeably. In order to make sure the second rule is also there instead of checking if I do certain things right I started to focus on being as relaxed as possible trusting the feelings. If something does not feel right just stop, stand up and repeat from the beginning.
Here is a video I filmed recently testing my cue in pair with c.f. shaft.
https://m.youtube.com/watch?v=WUEdkzI8QSE. I can tell now I’m feeling much better on those shots with some distance and with power. Of course I need to keep working but at least now I see the light at the end of the tunnel.
https://m.youtube.com/watch?v=xU6ME7kIF6g
Here is also a video I filmed with my student who has pretty solid fundamentals and stroke.
https://m.youtube.com/watch?v=Hg6WNUtGar8
I started to teach him at the age of almost 11 y.o. Of course while he was growing up his stance was changing and he had to adapt to his “new” hight and so on. Now he's 18 y.o. As a result in competitions when the stress is there on many shots he finds that comfortable body position by making some movements up and down into his stance untill he feels completely relaxed.
Here is a match where Nikita managed to show one of his most solid performances in the final of national 9-ball cup. You may notice those movements he does on some shots.
https://m.youtube.com/watch?t=4260&v=CWEc7-uk6fI&feature=youtu.be