being able to read the text is a
minimum requirement
Demanding crowd, eh?
One thing you can do to improve the fidelity of the UI is to change the compression of the images to User Interface 2d:
Do tell if it changes anything.
Other than that, the quality of widget components leaves a lot to be desired. If a sharp interface is what you’re after, either stick with regular widgets or widgets component in screen space mode. 
edit: cross posted, did not see your solution 