Icons don't align with language mode icons

[bugarela]

According to VSCode docs, language contributors can define a custom icon for the language. I've done this, but the icon alignment between my custom icon and the others looks quite bad when using the Seti icons. See the difference in the .qnt files:

I have tried a few different sizes, including following the directives and the .sketch file, but it always looks bad. However, it aligns fine with other icon packs. Some examples follow.
Material Icon Theme:

VSCode Icons (vscode-icons):

I'd expect the icons from Seti to align the same.