Peter, have you tried increasing the Bad Pointing Sample Criterion in TheSkyX? What maybe occurring is that post a meridian flip moving to the west, it the tolerance falls outside this value and is considered invalid so does not update the model.
Go to Preferences | Advanced. You'll see it in there. Try changing it to 0.75 or so as a starting point.
You could also add a few points manually from the west and not finalise the model to see if that would work.
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