I'm having a bit of trouble tuning my two Saphire 7870 OC Edition, which is a Pitcairn not a Tahiti. I've seen that others are getting as high as 420 on their Pitcairns, but I haven't been able to find their exact config.

I'm getting ~380k each, but my WU are pretty low, at 259 and 280. Here's the output from cgminer:

cgminer version 3.4.3 - Started: [2013-12-03 06:09:26]
--------------------------------------------------------------------------------
 (5s):707.2K (avg):757.7Kh/s | A:54284  R:1228  HW:248  WU:540.1/m
 ST: 1  SS: 0  NB: 50  LW: 610  GF: 0  RF: 0                   
 Connected to stratum.mypool.com diff 215 with stratum as user myuser.x
 Block: 8eed9c63b68cdb8c...  Diff:114M  Started: [07:46:17]  Best share: 81.5K
--------------------------------------------------------------------------------
 [P]ool management [G]PU management [S_]ettings [D]isplay options [Q]uit
 GPU 0:  58.0C 2542RPM | 380.7K/380.2Kh/s | A:24901 R:494 HW:143 WU:259.6/m I:20
 GPU 1:  58.0C 2591RPM | 380.3K/377.8Kh/s | A:29383 R:734 HW:106 WU:280.5/m I:20
--------------------------------------------------------------------------------


Here's a copy of my cgminer.conf:

{
"pools" : [
        {
                "url" : "stratum+tcp://stratum.mypool.com:3333",
                "user" : "myusername.x",
                "pass" : "mypass"
        }
]
,
"intensity" : "20",
"vectors" : "1",
"worksize" : "256",
"kernel" : "scrypt",
"lookup-gap" : "2",
"thread-concurrency" : "11520",
"shaders" : "1024",
"expiry" : "120",
"auto-fan" : true,
"gpu-dyninterval" : "7",
"gpu-threads" : "1",
"gpu-powertune" : "-5,-5",
"gpu-engine" : "900",
"gpu-memclock" : "1250",
"gpu-fan" : "65",
"log" : "5",
"no-pool-disable" : true,
"queue" : "0",
"scan-time" : "30",
"scrypt" : true,
"shares" : "0",
"kernel-path" : "/usr/local/bin"
}

I'm  gonna give a tip of the extra earnings for 10 days to anyone who can help me increase my hashrate.