As the FAQ guy already said, this app is only for stock dpi available afaik.
If you can't do it with the provided software, you could delete it through the root explorer.
From eXistenZ thread:
- Remove android-res.apk in system/vendor/overlay
and recommended by me: also the android-res36 or android36-res (actually I don't know the correct filename but one of them is correct)