I'm still 'in' as well, although to be fair, you can get good and bad advice from those who are still JW's, those who were JW's and those who have never been JW's. People's JW standing isn't a guarantee of good advice.
Bullies intimidate and overbear on people to control them. If they think they can get away with stuff they will continue to do it. They are entirely selfish and abusive, and enjoy it.
In my view there are two ways to deal with bullies, both of them mean taking it to them.
You can either front him out with a shouting match every time you meet. This is sticking up for yourself. He will fight against you to begin with but will stop when he see's he's no longer controlling you. Don't wait for him to talk to you, every time you see him you go up and give him verbal hell.
You can start recording your conversations while still being submissive to him. Only when you have enough evidence do you start to send bits to him and his friends/family. If you have a real peachy bit, send it to him and tell him you're going to send it to xyz as well.
If the elders get involved tell them you have evidence of his wrongdoing but would rather sort this out between just you and him, and that if the elders continue to badger you without evidence, then you'll just stick all this info in the local paper. Carry a 'solicitors letter' with you saying that you are considering taking action against all individuals who have slandered you or intimidated you, and that will include all those who take his side without evidence. Elders run a mile if they think their wallets are under threat.
In my experience bullies don't stop if you ask nicely. If he ever threatens you tell the police immediately.
You play poker, you know the score.