oddly, this works:
"pools" : [
   {
      "poolname" : "NiceHash-X13",
       "url" : "stratum.nicehash.com:4337",
       "user" : "1D75BgAientKNn8JbvxFifALmEENQK5Ztj",
       "pass" : "x"
      }


BUT I cant get this to work:
{
"pools" : [
   {
      "poolname" : "NiceHash-X11",
      "url" : "stratum.nicehash.com:4336",
      "user" : "1D75BgAientKNn8JbvxFifALmEENQK5Ztj",
      "pass" : "x",
      "pool-kernel" : "darkcoin-mod",
      "pool-intensity" : 17,
      "pool-thread-concurrency" : "8192"
   },
{
       "poolname" : "NiceHash-X13",
       "url" : "stratum.nicehash.com:4337",
       "user" : "1D75BgAientKNn8JbvxFifALmEENQK5Ztj",
       "pass" : "x",
       "pool-kernel" : "marucoin-mod",
       "pool-intensity" : "13",
       "pool-thread-concurrency" : "8192"
}
without it spitting out all rejects and hashrates of ~13kh

I really want to be able to have it switching between x11/x13, but at least the x13 4337 server operates on its own  (still no luck on 3337 for whatever reason?)
PS: its a quad R9 270X rig