I'm sure it's not best configs, but they work stable for me
R9 290, AMD v14.6rc2 + AB for UV, sgminer v4.1.0

~5.1 Mh, t < 80 deg (gpu uv) "kernel" : "x11mod", "intensity" : "0", "xintensity" : "50", "rawintensity" : "0", "worksize" : "64", "gpu-threads" : "2", "lookup-gap" : "0", "thread-concurrency" : "8192", "shaders" : "2560", "gpu-engine" : "1000-1000", "gpu-memclock" : "1200", "gpu-fan" : "50-60", "gpu-memdiff" : "0", "gpu-powertune" : "0", "gpu-vddc" : "0.000", "gpu-dyninterval" : "7", "gpu-platform" : "0", "temp-target" : "75", "temp-overheat" : "85", "temp-cutoff" : "95", "temp-hysteresis" : "3", "no-submit-stale" : true, "no-pool-disable" : true, "failover-only" : true, "failover-switch-delay" : "60", "queue" : "1", "scan-time" : "7", "shares" : "0", "tcp-keepalive" : "30", "expiry" : "28", "log" : "5", "kernel-path" : "/usr/local/bin", "api-listen" : true, "api-mcast-port" : "4028", "api-port" : "4028", "api-allow" : "W:127.0.0.1"

~3.6 Mh, t < 80 deg (gpu uv) "kernel" : "x13mod", "intensity" : "17", "xintensity" : "0", "rawintensity" : "0", "worksize" : "64", "gpu-threads" : "2", "lookup-gap" : "0", "thread-concurrency" : "8192", "shaders" : "2560", "gpu-engine" : "1000-1000", "gpu-memclock" : "1200", "gpu-fan" : "60-60", "gpu-memdiff" : "0", "gpu-powertune" : "0", "gpu-vddc" : "0.000", "gpu-dyninterval" : "7", "gpu-platform" : "0", "temp-target" : "75", "temp-overheat" : "85", "temp-cutoff" : "95", "temp-hysteresis" : "3", "no-submit-stale" : true, "no-pool-disable" : true, "failover-only" : true, "failover-switch-delay" : "60", "queue" : "1", "scan-time" : "7", "shares" : "0", "tcp-keepalive" : "30", "expiry" : "28", "log" : "5", "kernel-path" : "/usr/local/bin", "api-listen" : true, "api-port" : "4028", "api-mcast-port" : "4028", "api-allow" : "W:127.0.0.1"

this is most important for speed and stability   for fine tuning   <---   <---   <---   <---   <---

hope it will help