Having the "shaders" value at 0 means that it will default to whatever the native value would be for the GPU so changing that won't do anything.
OP; What is the exact model number on the sticker on the back of your GPU? It should look something like FX-797A-**** If it has a V1.0, 2.0 or 5.0 list that too.
I would say you might need to flash a new BIOS to your card but getting ~600 is higher than most people(including myself) get without a BIOS flash. This tells me that you have a setting issue. If you tell me the model number I can help tweak it.
PN: 299-1E208-000SA and SKU#21197-00
in GPU-Z is says REV: N/A so i guess its 1.0??? Many thanks in advance for help!!
Try this:
"intensity" : "13",
"vectors" : "1",
"worksize" : "256",
"kernel" : "scrypt",
"lookup-gap" : "2",
"thread-concurrency" : "8192",
"shaders" : "0",
"gpu-engine" : "925",
"gpu-fan" : "65-65",
"gpu-memclock" : "1550",
"gpu-memdiff" : "0",
"gpu-powertune" : "20",
"gpu-vddc" : "0.000",
"temp-cutoff" : "95",
"temp-overheat" : "85",
"temp-target" : "75",
"api-mcast-port" : "4028",
"api-port" : "4028",
"expiry" : "5",
"gpu-dyninterval" : "7",
"gpu-platform" : "0",
"gpu-threads" : "2",
"hotplug" : "5",
"log" : "5",
"no-pool-disable" : true,
"queue" : "1",
"scan-time" : "5",
"scrypt" : true,
"temp-hysteresis" : "3",
"shares" : "0",
"kernel-path" : "/usr/local/bin"