Extremely Low WU (Almost Non-Existant!)

I am mining darkcoins and CryptCoin at Multipool. I'm running an MSI 280X 6G on Windows 7x64. I've attempted a couple different distros of sgminer and both the x11mod and the darkcoin-mod. I've tested several different recommended configurations for my card, but no matter what I do my WU/m is extremely low!! Where others are looking for 90% of the hashrate, my WU/m is almost non-existant!! This is what I'm getting after 24 hours:

3.770Mh/s
WU: 0.052/m

This has been about the same no mater which distro of sgminer, which kernel, or which conf file I've tried. It is only resulting in pennies per day ($USD). Can anyone tell me what I'm doing wrong here??

Here's the conf file I'm using:

Code:

{
"pools" : [
  	{
                "url" : "stratum+tcp://us-west2.multipool.us:11111",
                "user" : "user",
                "pass" : "pass",
		"kernel" : "darkcoin-mod"
	},
        {
                "url" : "stratum+tcp://us-west.multipool.us:11111",
                "user" : "user",
                "pass" : "pass",
		"kernel" : "darkcoin-mod"
        }
]
,
"intensity" : "18",
"worksize" : "256",
"algorithm" : "darkcoin-mod",
"lookup-gap" : "2",
"thread-concurrency" : "8192",
"shaders" : "2048",
"gpu-threads" : "2",
"gpu-engine" : "1155",
"gpu-fan" : "65-85",
"gpu-memclock" : "1800",
"gpu-powertune" : "0",
"temp-cutoff" : "95",
"temp-overheat" : "85",
"temp-target" : "65",
"api-mcast-port" : "4028",
"api-port" : "4028",
"expiry" : "120",
"failover-switch-delay" : "60",
"gpu-dyninterval" : "7",
"gpu-platform" : "1",
"device" : "0",
"log" : "5",
"no-pool-disable" : true,
"no-client-reconnect" : true,
"queue" : "1",
"scan-time" : "60",
"tcp-keepalive" : "30",
"temp-hysteresis" : "3",
"shares" : "0",
"kernel-path" : "/usr/local/bin"
}