Let's face it, someone running 6 S3s would have MUCH more than 1.2 TH/s on a pool with a legit cgm on their rigs...
They should check that all the chips are firing, no X's in the status screen.
My S3+ averages about 490GH/s, I just turned it back on as a lottery machine a few days ago.
"hashrate1m": "592G", "hashrate5m": "497G", "hashrate1hr": "486G", "hashrate1d": "484G"
6 S3s should be just under 3TH/s if they are configured correctly and not broken parts.