How to change Artist Name tag from uppercase to capitalized in iTunes

I have set the iTunes media folder location to an external hard drive (with around 10,000 ALAC files, all perfectly tagged, with most common tags), with the consolidating files option by iTunes turned off.

I have Artist Name tags written in uppercase but since I’ll be listening to music more often on mobile devices the uppercase names take more length on the screen and therefore I wish to change them to capitalized (manual custom correction).

When I do that outside of iTunes with the 3rd party tag editor (Tag.app) and open iTunes it still shows the artist name in uppercase.

I tried then to change that tag in iTunes itself in the info. tab (despite the fact that even there it showed the name capitalized), but then it split the album in two with the first song in the 1st and the rest in the 2nd album (which is the same album).

How can I change the artist name tag from uppercase to capitalized (without screwing the iTunes up) and should I do it only from the 3rd party app. or iTunes or both?