GHash has been sitting above 25GH fairly consistently, with or without sfire mining there.
That's not correct. I am following the pool on an hourly basis and I can tell you in all certainty that whoever this 20GH guy is, he's the one that gets GHash.IO above 25GH/s to 45GH/s +/-.
Pool is either <25GH/s or above 45GH/s (+/-).