Which drivers do you use? The miner can't recognize graphic card (3xR9 380) no matter which index I try. Other miners work fine...
You should copy this part three times with index 0, 1, 2 to run all three.
{
"index": 0,
"corefreq": 1000,
"memfreq": 1500,
"fanspeed": 65,
"powertune": 20,
"threads": 1,
"rawintensity": 1336,
"worksize": 8
}