You should restrict to one water sport and not try to learn all at once. That's too much.
Your balance is good, but your head is too high, and you make a banana. Look down to the pool bottom and your back will lengthen too.
Your recovery is quite well and relaxed, but try an earlier entry and a deeper spear. Your stroking arm has a dropped elbow. You should try to catch more water rather with the forearm than with your hand, fistgloves can help to feel the grip ;o)
You wrote, you already swam 1200 yards with fairly easy stroke.
besides the Kaizen-learning-cycle:
conscious incompetence and
there is another rule wich says:
learning is always up and down. You learn something, you think you mastered it and then comes the point where you think, everything you learnt is gone and you can't do anything against it. You try hard but it doesn't work at all. That's normal and your skill will reappear but of cause this phases are frustrating.
In Ving Tsun I had weeks and months where I had the feeling I was just as far as a novice. The last phase was in autumn. I'm doing VT for 8 years now, 3 times a week, several week ends, basic training at home... and I wasn't able to do basic Drills in a way that is expected in my level.
These regress times will occur from time to time. They mark that you achieved something new. But that new skill is not steady yet. You can't do anything against this regression but having patience and go on until this phase ends. Sometimes a short break can help. A holiday or going to the pool just to relax and play in the water. Trying a new style, butterfly for example and then going back to freestyle calm and serene again.
Another point: I'm also often reluctant correcting all flaws I see in the technique of my students. It makes no sense to work on new focal points on a higher level when the student is just on the way getting the clue on the lower level. Sometimes it's better to wait and correct the technique after the basics have really been imprinted.
In your example: Overrotating of cause is not really good. But there are other things, balance, streamlining, timing... which are more important and which should be imprinted first before working on higher skills.
I can't tell you if this is the normal frustrating "step back" in the normal learning cycle or if you are confused by small focal points that you try to settle too early and before the basic is set.
First I would concentrate on the very basics. Then I would add ONE FP. So in your case: relaxed swimming with slightly over rotation. When you work on your rotation other things will not work that worked before. Never mind, concentrate on the rotation you canít concentrate on several thing at once.
You will have to be patient. Keep in mind that it takes time to imprint a new skill and also that you will not hit the point at once. In your example, you had an overrotation in your stroke. When you try to fix it you will tend to underrotation. That you will correct with overroation. Less than at the beginning, but you will hit the goal after several corrections in the one and the other direction.
And your decision to take lessons with a single coach seems well done. Sometimes several coaches can be inspiring, sometimes itís confusing.