The overrides might solve this problem, but I wouldn’t really recommend it. From this point on, any changes you make to the master pages will not take affect on the pages with overrides.
If you are finished with your project, the overrides will do.
If you are not, then what you could do is duplicate the standard master page, edit it to shorten the music frame (blue) on the bottom. Then, apply a master page change to only the pages you have an issue.
This is a little more „stable“ to possibly upcoming changes. (Though not all changes of course, such as reordering the flows etc.)