Hi, Anyone have configuration to R9 280X with X15 algo

Actually i have only 1.8Mh/s when i read the average on R9 280X is 2.6MH/s
Could you help me

Hi my settings for 3x Gigabyte R9 280X OC
{
"name": "x15",
"nfactor" : "10",
"algorithm" : "bitblock",
"intensity": "18",
"gpu-engine": "1110"
},
"vectors": "1",
"worksize": "256",
"lookup-gap": "2",
"thread-concurrency": "8192",
"shaders": "2048",
"gpu-memclock": "1500",
"gpu-powertune": "-20",
"gpu-vddc" : "1.112",
...
but I'm not able to get over 2200 per card