Hi again - I checked it again and found that, in order to make image looking in Omero-Insight as in Matlab, it's enough simply to use (I') instead (I) on OME.tiff creation input, but in order to save image properly, one needs to keep this size flip-flop in createMinimalOMEXMLMetadata.
So I leave it for now without change in my repo, as it seemingly falls into "Don't fix it if not broken" category.
Best regards,
Y.