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I believe this isn't working because you aren't trying to set a slug attribute so that function never gets hit.
I'd suggest setting $this->attributes['slug'] = ... in your setTitleAttribute() function so it runs whenever you set a title.
Otherwise, another solution would be to create an event on save for your model which would set it there.
Edit: According to comments, it's also necessary to actually set the title attribute in this function as well...
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