Low hashrate
I am completely new to Xmrig, but want to be able to mine all the alt coins on Monero Ocean.  I have downloaded 2.8.1 for amd.  I am running 6 x Vega 64's and no CPU.  I have been running stak and getting about 12,100h/s before this.  I tried using 2 threads by just copying/pasting index 0 etc, but xmrig-amd-exe wouldn't even start.  Please advise:)  See below for my config.json & hashrate...

{
    "algo": "cryptonight",
    
"api": {
"port": 0,
"access-token": null,
"id": null,
"worker-id": null,
"ipv6": false,
"restricted": true
    },
"autosave": true,
"background": false,
"cache": true,
"colors": true,
"donate-level": 1,
"log-file": null,
"opencl-platform": "AMD",
"opencl-loader": "OpenCL.dll",
"pools": [
        {
"url": "gulf.moneroocean.stream:10128",
"user": "purposefully left out for this example",
"pass": "purposefully left out for this example",
"rig-id": null,
"nicehash": false,
"keepalive": false,
"variant": -1,
"tls": false,
"tls-fingerprint": null
        }
    ],
"print-time": 30,
"retries": 5,
"retry-pause": 5,
"threads": [
{"index": 0,
 "intensity": 1920,
 "worksize": 8,
 "strided_index": 2,
 "mem_chunk": 2,
 "unroll": 8,
 "comp_mode": false,
"affine_to_cpu": false},

{"index": 1,
 "intensity": 1920,
 "worksize": 8,
 "strided_index": 2,
 "mem_chunk": 2,
 "unroll": 8,
 "comp_mode": false,
"affine_to_cpu": false},

{"index": 2,
 "intensity": 1920, 
"worksize": 8,
 "strided_index": 2,
 "mem_chunk": 2,
 "unroll": 8,
 "comp_mode": false,
"affine_to_cpu": false},
   
{"index": 3,
 "intensity": 1920, "worksize": 8,
 "strided_index": 2,
 "mem_chunk": 2,
 "unroll": 8,
 "comp_mode": false,
"affine_to_cpu": false},
    
{"index": 4,
 "intensity": 1920,
 "worksize": 8,
 "strided_index": 2,
 "mem_chunk": 2,
 "unroll": 8,
 "comp_mode": false,
"affine_to_cpu": false},
   
{"index": 5,
 "intensity": 1920,
 "worksize": 8,
 "strided_index": 2,
 "mem_chunk": 2,
 "unroll": 8,
 "comp_mode": false,
"affine_to_cpu": false}
   ],
    
"user-agent": null,
"syslog": false,
"watch": false
}

| THREAD | GPU | 10s H/s | 60s H/s | 15m H/s |
|      0 |   0 |  1507.6 |     n/a |     n/a |
|      1 |   1 |  1506.7 |     n/a |     n/a |
|      2 |   2 |  1505.2 |     n/a |     n/a |
|      3 |   3 |  1510.1 |     n/a |     n/a |
|      4 |   4 |  1505.7 |     n/a |     n/a |
|      5 |   5 |  1506.7 |     n/a |     n/a |
[2018-10-12 19:53:02] speed 10s/60s/15m 9042.0 n/a n/a H/s max 9051.7 H/s