I have no empirical evidence on this, but I think it has to matter whether the existing grade was given in the days when there were no half-grades versus a grade that was given when halves were already available.
If it was from earlier times, the TPG is not admitting to a "mistake" by bumping the card...they are just adjusting for the new point scale. But if the original grader was allowed to use halves, then a change kinda is an admission of a mistake...I suspect that is much harder to get.
Cheers,
Blair
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