I’m an engineer so I don’t expect a turnkey experience. 3d-printing may never reach that level. My first two printers were Creality’s. With them, you could kind of assume that nothing was straight and almost nothing was tightened 
. Then I went to Prusa and it was the complete opposite - it just worked once it was set up. But it was slow and the build volume barely usable.
When i went for the X1C it was for the larger build volume, the enclosure and the speed. But at that price point I had expected the stability of the Prusa. The X1C hasn’t been stable and when problems are around the corner, tougher to fix than with the Prusa, partly because of the more closed ecosystem.
I mainly print large engineering parts for my hobby so the tolerances need to be tight.
Many thank’s for your valuable help. Very much appreciated.
I will continue to fault trace and if I find the culprit I will post the solution here, for others to benefit from.