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The weight setting in the font file itself and the weight setting on Kobo are two different things. The font file weight is fixed and will not be affected by the weight in advanced settings. Changing the weight in advanced settings should cause all variants of the font to display differently, and not leave italic unaffected. If you're sure you've followed all Font-Forge steps to change the weight in the font files correctly, the issue might just be the file names. Make sure they are exactly like this:
Bookerly-Bold.ttf
Bookerly-BoldItalic.ttf
Bookerly-Italic.ttf
Bookerly-Regular.ttf
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