login page font very thin
The issue is you're modifying two different global settings: AppleFontSmoothing and CGFontRenderingFontSmoothingDisabled. 

AppleFontSmoothing is an integer, represented from 0-4, whereas CGFontRenderingFontSmoothingDisabled is boolean. I'd recommend starting by deleting both, both as your user and globally (sudo) defaults delete -g AppleFontSmoothing; same with CGFontRenderingFontSmoothingDisabled.

The Menu Bar's process is called SystemUIServer. So you can restart the Menu Bar (see what your tweaks do) with killall SystemUIServer.