I'm trying to get scrypt-n to work with sgminer. Can somebody please check what is wrong? I get 100% rejected and sgminer says "low difficulty share of 0.00"

{
"pools" : [
        {
                "url" : "stratum+tcp://useast.blackcoinpool.com:6666",
                "user" : "XXX",
                "pass" : "XXX"
        }
]
,
"xintensity" : "4",
"vectors" : "1",
"worksize" : "256",
"kernel" : "psw",
"algorithm" : "adaptive-n-factor",
"failover-only" : true,
"lookup-gap" : "2",
"thread-concurrency" : "8192",
"shaders" : "2048",
"gpu-engine" : "1080-1080,1080-1080",
"gpu-fan" : "30-70,30-70",
"gpu-memclock" : "1500,1500",
"gpu-memdiff" : "0",
"gpu-powertune" : "0",
"gpu-vddc" : "0.000",
"temp-cutoff" : "95,95",
"temp-overheat" : "85,85",
"temp-target" : "75,75",
"api-port" : "4028",
"expiry" : "1",
"gpu-dyninterval" : "7",
"gpu-threads" : "2",
"hotplug" : "5",
"log" : "5",
"no-pool-disable" : true,
"queue" : "0",
"scan-time" : "1",
"scrypt" : true,
"temp-hysteresis" : "3",
"shares" : "0"
}