did you delete the old *.bin files ... opencl may need to recompile them ... stop cgminer and del them and restart, it will recompile them automatically based on your config file.
EDIT: post portion of cgminer.conf following the Pools [ ] section ... no need to know your pools or worker info LOL
found this on the net for an r9 270x so copied it
"no-submit-stale" : true,
"intensity" : "20",
"vectors" : "1",
"worksize" : "256",
"kernel" : "scrypt",
"auto-fan" : true,
"temp-cutoff" : "85",
"temp-overheat" : "75",
"temp-target" : "70",
"expiry" : "30",
"log" : "5",
"queue" : "1",
"retry-pause" : "5",
"submit-stale" : "false",
"scan-time" : "30",
"scrypt" : true,
"temp-hysteresis" : "3",
"shares" : "0",
"shaders" : "0",
"thread-concurrency" : "11263",
"gpu-thread" : "0",
"gpu-engine" : "1120",
"sharethreads" : "32",
"lookup-gap" : "2",
"gpu-powertune" : "00",
"gpu-memclock" : "1500"
}
with these settings I am pulling in 486 per card n average, gpu4 is a little low at 473
I want to force the fans to run pretty high not auto tune lie this one is but its getting me hash's now