Phoenix,
You guys may want to consider legal action. Seems like pretty clear cut defamation and anyone that switches off of PhoenixMiner because of their misinformation would be legitimate legal damages. If they want to be bullies a good legal punch in the nose is the least they deserve. If nothing else a letter from a lawyer may be enough to get them to issue a public apology if only out of fear of the legal follow through.
Also not sure what kind of Admin controls you have on this thread, but maybe prevent people from posting links, I've seen 2 brand new accounts in the past few minutes posting "temporary links for phoenixminer"
Maybe see if Bitcointalk can figure out where the accounts are coming from. Might be an individual bad actor trying to take advantage.
But problem is that way they might leak their true identities. And that way might achieve what NH wants, for whatever sinister reasons they need it (lets say using some of their BTC on dark web, or so).