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It certainly is a beast to use. Well done.
Regarding the diffraction softening you're finding out about. I know Brian "LordV" Valentine did some testing a while ago, and recommends opening up the aperture as you increase the magnification. At 1:1 he shoots around f/11 as you mention. 2:1 I think he might drop to f/9 or so, 3:1 f/7 and so on down to 5:1 he might be down around f/5.6 or something. Those sort of mags, that close to subject, and those sort of apertures, the DoF is raaaaazor thin! No wonder you're getting into focus stacking territory.
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