Heres mine for 4x MSI 280x.
"expiry" : "28",
"queue" : "1",
"scan-time" : "7",
"failover-only" : true,
"kernel-path" : "/usr/local/bin",
"no-submit-stale" : true,
"auto-fan" : true,
"gpu-threads" : "2",
"gpu-engine" : "850,1080,1060,1050",
"gpu-fan" : "30-60,30-80,30-80,30-80",
"gpu-memclock" : "1400,1500,1500,1500",
"intensity" : "13,13,13,13",
"gpu-powertune" : "-20,-20,-20,-20",
"temp-target" : "75,75,75,75",
"temp-overheat" : "80,80,80,80",
"temp-cutoff" : "85,85,85,85",
"temp-hysteresis" : "3",
"worksize" : "256,256,256,256",
"lookup-gap" : "2,2,2,2",
"thread-concurrency" : "8193,8193,8193,8191"
First is underclocked coz i put my finger in the fan, and now it can only run at 60% speed. For all of them i checked different gpu-engines and tc.
First try 1020/1030/1040/1050/1060/1070 engine and choose the best, then try 8191/8192/8193 tc.
api screenshot
http://prntscr.com/3fsnq7