The PS autohinting of “exclam” seems correct, but the hinting which applies to the rotated ”exclamdown” after decomposition seems wrong. See images attched.
It works for me. Can you send me the file?
One (almost) unrelated thing: When building a exclamdown, you should rotate 180° or flip in both directions.
In this case it doesn’t matter much, but it is a good habit to always rotate instead of mirroring.
Exactly, especially in anticipation of making the italic.