How do I get more than 72kh/s on my R9 290 Gigabyte OC

This is my Config file:

"api-allow" : "W:127.0.0.1",
"api-listen" : true,
"expiry" : "10",
"fix-protocol" : true,
"kernel-path" : "/usr/local/bin",
"no-submit-stale" : true,
"queue" : "0",
"scan-time" : "1",
"gpu-threads" : "1",
"gpu-engine" : "1040",
"gpu-fan" : "70",
"gpu-memclock" : "850",
"gpu-powertune" : "-10",
"intensity" : "12",
"temp-target" : "85",
"temp-overheat" : "90",
"temp-cutoff" : "92",
"vectors" : "1",
"worksize" : "64",
"lookup-gap" : "2",
"shaders" : "0",
"thread-concurrency" : "30592",
"scrypt-jane" : true,
"sj-Nfmin" : "4",
"sj-Nfmax" : "30",
"sj-time" : "1388949883"
}

These are my outputs:

NOTE: higher Memory clock speed and Powertune changes nothing


 cgminer version 3.7.2 - Started: [2014-03-08 02:38:33]
--------------------------------------------------------------------------------
 (5s):72.39K (avg):72.50Kh/s | A:384  R:0  HW:0  WU:59.9/m
 ST: 1  SS: 0  NB: 1  LW: 208  GF: 0  RF: 0
 Connected to pool.cachecoin.net diff 16 with stratum as user blazin.hcm
 Block: 3d3b0328...  Diff:68  Started: [02:38:33]  Best share: 665
--------------------------------------------------------------------------------
 [P]ool management [G]PU management [ S ] ettings [D]isplay options [Q]uit
 GPU 0:  59.0C 2870RPM | 72.38K/72.50Kh/s | A:384 R:0 HW:0 WU: 59.9/m I:12
--------------------------------------------------------------------------------

GPU 0: 72.4 / 73.3 Kh/s | A:16  R:0  HW:0  U:2.52/m  I:12
59.0 C  F: 59% (2870 RPM)  E: 1040 MHz  M: 850 Mhz  V: 0.000V  A: 100%  P: -10%
Last initialised: [2014-03-08 02:38:34]
Intensity: 12
Thread 0: 72.4 Kh/s Enabled ALIVE

[E]nable [D]isable ntensity [R]estart GPU [C]hange settings
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