@Garf1, "however PA wants to change the cluster size to 4."---Could you take a screenshot so that we check? AOMEI Partition Assistant doesn't change the Custer size. And, please also take a screenshot of the Custer size(=8) of your partition so that we check.
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https://www.diskpart.com/help/index.html
Partition Assistant Manual
https://www.diskpart.com/download/UserManual.pdf
And, please also take a screenshot of the Custer size(=8) of your partition so that we check.