I'm surprised that the hash rate on EMC hasn't dropped at all.
I'm not. If they are on there they are running small potatoes. I'm #4 there and running only 8TH. Biggest miner on EMC is 33 TH with #2 @ 20TH.
Why are you still mining on EMC? I would be worried that it will shut down at any moment and any account balances will be locked up.