ChrisRowland wrote: Your log example, between the first and second orange text doesn not show a flip because the pier side does not change.
I haven't looked at the driver in detail but it probably checks the status that the mount reports to the driver to decide that a slew has finished. If the mount does not think it has finished slewing then trying to second guess it is asking for trouble.
I would have expected that slew problems would already have been flagged up before the meridian flip process was changed.
Reverting the meridian fip is the only way to be sure it isn't involved.