the head stock is angled so i dont think thats a problem, and I'm sure the frets are level. I just don't know what to try next. How important is the nut slot widths. i checked them with a feeler gauge and they're prety close to the string width. I don't have nut slot files, just a saw thats about the right width.
do the strings matter? theyre just regular acoustic dulcimer strings?