When he first moved in he didn't know you so he had no reason to annoy you. He is a heavy guy who walks heavily which is normal for him. After you complained and reported him he moderated for a while but eventually went back to his normal way of walking. Then you complained some more and he got annoyed and is now purposely annoying you.

In apartment living you need to compromise. You cannot expect him to tip toe around in his own home. To him he was being harassed for behaving normally so he's angry. Stop complaining and reporting him and he will eventually stop actively annoying you. If you still can't stand the way he walks there is no cure other than to move out. You can't expect him to change the way he walks just for you.