FF6Tools - Browser-Based ROM Editor

Just looked at that general area in my own project (which has used FF3USME's dialogue import before, but not changed the width of the font) and that area is untouched. I don't think it's the dialogue import, I'm betting your new font is bigger and USME is relocating it in a weird way.

Maybe try importing the script but leaving the font alone, instead changing it in FF6Tools under System/Small Font Graphics?