Chord Fonts - Only 4 work...and none of them are great

It's important to understand there is no single definition of "correctly".

The defaults in MuseScore are based on how chord symbols are typically formatted by most major publishers of popular music such as Hal Leonard or Warner / Alfred. These are usually completely unsuperscripted, so Edwin all by itself gives that look right out of the box.

The MuseJazz and Petaluma Script fonts as well as the superscripting style settings and the "Jazz" appearance option in general (separate from font choice or superscripting options) are based on how chord symbols are typically formatted by major jazz publishers such as Sher Music or Kendor and following the standards laid forth by Brandt & Roemer in their seminal work on the subject. These all adhere to pretty specific rules on formatting that do not include superscripting the abreviations for major, minor, or suspended except when "ma" is used as a modifier after "mi" as in "Cmi(ma7)". See for example https://teachers.stjohns.k12.fl.us/fowler-r/wp-content/blogs.dir/1024/f… if you don't have the Brandt/Roemer book this is based on. This chart comes form the Sher Music fakebooks, but it's also pretty much what most big band publishers follow.

But it's true that other random publishers might do things differently still, and maybe you are more accustomed to how one of them does it than the way the major publishers we follow do things. If you post a sample image showing the specific result you want (eg, a scan from a published work you are trying to emulate instead of the major publishers we already do emulate), someone can probably help you achieve that result by either pointing you to a font that already emulates it internally, or creating a custom chord description XML file that allows virtually any appearance you want.

MuseScore provides tons of flexibility but is designed so that the most standard things - those done by the largest publishers in the world - happen by default, and less common things might require some additional customization.

Things like superscripting "maj" and "sus" are not very common in the world of professionally published music. It is done in a few handwritten charts I know, but not generally done by professional editors except when going out of their way to emulate the look of some particular copyist's handwriting. The latter was the case, for example, when I worked as an editor on the Hal Leonard "Real Book" series. Even though Hal Leonard does not normally format their chord symbols in that way at all (they use the Brandt & Roemer system - ma/min instead of maj, not superscripted, etc), they did make the conscious choice to follow the original illegal Real Book more idiosyncractic look of the original student-produced handwriting in this series specifically just to stay consistent. And somewhere floating about you should be able to find a custom XML file already that emulates that specific style within MuseScore. So if that's your goal, it's pretty much a done deal already.

But again, there is no one single standard, so if you want help in reproducing the look of some particular published (or even unpublished) chart, just post an example so we can understand and assist better.