Apologies if my comments have already been addressed but it is rather tricky to follow a problem across multiple threads.
In the discussions, I did not see much about print settings or geometries and assumed that this must have been ruled out early. However, looking at your most recent post (in the other thread), it appears like they may have a bit more to do with the problem than any given chamber temp.
I believe it would help everybody, and in particular people who regularly print ABS, if you could share screenshots of your material settings, your print settings and also slicer images of the model. It makes it much easier to give specific suggestions and justifications for them.
With respect to the failure image shown in the “Very large layer shift two times in a row?” thread, this looks like a typical nozzle collision which in my PETG experience occurs with crossing infill and local warping. The latter does tend to get worse with lower chamber temps/distance from heat bed. As does the moment arm to the bed (but that did not look like an issue).
So, comparing ABS (fan) settings, model slicing parameters with the settings for ABS used by other ABS printers is probably the quickest route to having successfull ABS prints again.