How are the x-direction locations of non-spacing marks determined? I get the impression that these marks are supposed to be positioned to base glyphs with GPOS mark attachments. But it seems like they’re often positioned by locating them far left of zero within their zero-width boxes.
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You need to find a compromise. Making it work with o will be okayish with many other letters, but of course not with extreme widths like dotlessi or w. Nevertheless, a misaligned accent might still be better than none at all.