Espi, You seem like a very thoughtful person, which is a good thing! Exercise and sport is much more interesting when one can see it from all angles, including the scientific. Here are a couple of articles you may be interested in concerning the sport of weightlifting.
The first one concerns overcoaching/overthinking in the weight room:
Overcoaching In The Weight Room
The second two deal with different approaches to teaching/learning the snatch and the clean and jerk. The take home point is to learn that there is no such thing as "perfect form", only form that works for the individual at that specific time and place. What that means is form and performance will vary from day to day and individual to individual. The key to this sport is finding what works best for you on that day, and then maximizing it. If that means one day you set a
PR, while another you struggle just to make 1 out of every 3 reps, so be it, as long as you are always seeking your best.
Different Approaches To Teaching The Snatch
Different Approaches To Teaching The Clean
I hope that lends you a bit of help! Coach D