I agree with smokey. Saying for people to look now, or you demoing now, or taking SS's now, well... basically anything since the demo really proves nothing. I would assume if you were using a hack, you would have gotten rid of it by now. That would only make sence.
Advice:
IMO, the only place you really need to "defend" yourself is your clans forums. Say your peace in other forums, but if your clan believes you, thats what matters most.. but using UE for example..... PO believes there was a hack involved. I assume he will ban your IP for that reason. But remember, he is going off of his opinion of the demo......theres 0 that you can do after the demo to defend anything. Wall hack demos, to an extent, are strictly opinion related. Its fairly hard to get someone who thinks its clean to believe its not..... and almost impossiable to get people who believe its a hack to think its clean. The demo is what the opinions are comming from. Hack or not all you can do is let each clan decide if you will be banned from their server, find out who didnt ban you.... and keep playing the game where you are welcomed.
As of now, I dont believe you were using a hack in that demo, but I will leave it to the clan as a whole to look into.