Hey, I have some update on this issue :D I didn’t solve it yet but I know why you’re having only 300 out of your 633 entries. I’m currently looking for a workaround.
Edit: I know how to fix it, I’ll do a PR tomorrow :-)
The PR has been created here https://github.com/animenotifier/mal/pull/1
You can follow the evolution of this on github now!