nprofile1qy2hwumn8ghj7un9d3shjtnddaehgu3wwp6kyqpqxqvg6z2tg4ap6226ylzrppvgak9vh5vdadx5g0ygjhspyzj24zhshemjt5 (nprofile…mjt5) I did then go on to read about your various approaches to handling these combining lowlines. And of course I double-checked the source to confirm that all thicknesses and alignments are equal of course.
I see now what you’re seeing between s̱ and ẕ.
So in the d̲z̲ sequence are you substituting d+uni0332 with ḏ and similarly with ẕ and then introducing the connector? That would explain thinner rendering of precomposed glyphs not matching thicker rendering of positioned connector