Greg generously replied to me and provided his valuable comments about my playing.
The major reason of my problems according to his observations… well – you guess: TOO much tension even when I get only at E in the staff.

Honestly saying I was aware of that but to know something and admit it is one thing and to overcome bad habits is an entirely different effort.
Here is where Greg’s method should help – I’m going to stick with it.
Lot’s of work ahead…
Thanks, Greg! You are a REAL gentleman.