that's pretty bad hash you got there, you should try this, the core make the big difference
1040 core /1500 mem, -g 2 --thread-concurrency 8192 -I 13(same as regular scrypt)
Im running the following, which seems pretty close to what you say.
"api-listen" : true,
"expiry" : "1",
"no-submit-stale" : true,
"scan-time" : "1",
"auto-fan" : true,
"gpu-threads" : "1",
"gpu-engine" : "1050",
"gpu-fan" : "0-85",
"gpu-platform" : "0",
"gpu-memclock" : "1500",
"gpu-powertune" : "0",
"intensity" : "13",
"temp-target" : "85",
"temp-overheat" : "90",
"temp-cutoff" : "95",
"temp-hysteresis" : "1",
"vectors" : "1",
"worksize" : "256",
"lookup-gap" : "2",
"thread-concurrency" : "8193",
"no-pool-disable" : true
Try the following, I manage to get 350kh on my 7970s/280x's on sgminer-4.1.271:
"api-allow" : "W:127.0.0.1",
"api-listen" : true,
"expiry" : "5",
"failover-only" : true,
"kernel-path" : "/usr/local/bin",
"no-submit-stale" : true,
"queue" : "0",
"scan-time" : "5",
"gpu-threads" : "2",
"gpu-engine" : "1050",
"gpu-fan" : "60",
"gpu-platform" : "0",
"gpu-memclock" : "1500",
"gpu-memdiff" : "0",
"gpu-reorder" : true,
"intensity" : "13",
"temp-target" : "80",
"temp-overheat" : "85",
"temp-cutoff" : "95",
"vectors" : "1",
"worksize" : "256",
"lookup-gap" : "2",
"shaders" : "0",
"thread-concurrency" : "8192",
"scrypt" : true,
"MinerID" : "0",
"no-pool-disable" : true