I increased the walling but makes no diff.
It starts shifting in the height were i have the opening for an USB-B. But the side it has the big opening is better then the side that does not have the big opening.
So it would seem that the change in movement because of the opening is the reason. And i can understand the retraction argument but should it then not be on the side of the big opening ?
I will try in the meantime to the test you propose to see if there is a difference.
btw. I still am using Arachne and not the classic one.