My mess up your site’s fonts

Remove WP Branding works well enough when it comes to removing the WP-Logo from the admin dashboard, but fails to replace the same logo on the login / registration forms. Here, the custom logo’s dimensions are often not accepted, even if below 150 px (the default) or when the dimension are entered by hand. Another issue that bothers me is that once you have used the option to enable Goolge-Fonts or the provided theme, you cannot completely reset the design of the admin panels, some of the fonts remain serif while others are san-serif.