Thanks eschwartz that cleared up some things. My books are all side-loaded, I was just under the mistaken impression that if I set the mobi-asin, then Calibre would write EXTH 113 with it, but I was confusing that with what the Quality Check plugin does (after inspecting its source).
I guess there isn't a point in me creating the mobi-asin myself then is there? If the Quality Check plugin handles the creation of that for AZW3 files?
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