I did not get any email notification so my response is a little bit late ...
Yes i placed it as close as possible to the rotational axis
I decaped one but i could not see any damaged. Maybe microcracks or just cheap soldering and components.
The other ESP8266 is working still without problems
I'm actual finished!
If you live in Vienna I will display this project on the Maker Faire (https://makerfairevienna.com/) STAND E84