>Ditto still does not show the usernames correctly and profile pictures

You need kind 0s in the database for those people. Check this post: https://gleasonator.dev/nostr:npub1q3sle0kvfsehgsuexttt3ugjd8xdklxfwwkh559wxckmzddywnws6cd26p/posts/a8badb480d88f9e7b6a090342279ef47ed0e0a3989ed85f898dfedc6be94225f