Thank you! A bit hidden there, slightly different naming, but should be the same action in fact.
I have progressed with the issue - my previous statement that the displacements are the result of collisions with the nozzle is most likely incorrect - I have set my (heavily modified) Anycubic machine to run at 150% print speed and I got also wall displacement problems…
Then I printed the next smaller size chain on P1S and was roughly OK - two walls had a minor displacement but the final result is usable.
Conclusion - not a slicer problem 
- just a design with inertia issues…