Hi,
Sorry if the problem has already been solved, I did not read the entire thread.
I am willing to give this miner a try but it draws far more power than claymore for a similar or little higher hashrate.
I use it with win10 with 6 RX580.
With claymore (11.9), 186Mh/s @ 830W
With Phoenix (3.5d), 187Mh/s @ 1150W!
I tried to use the same values for clocks and voltages (which are set in config.txt) or to let it blank without any effect.
What am I doing wrong?
Install latest version of AMD drivers then switch to compute mode.So you assume that he got 187 Mh/s from 6xRX580 with compute mode off?

I think noobs account should not be allowed to give advice, only ask...
to answer OP: looks like clock and/or voltages are not properly applied, because power draw for phoenix is about the same as for claymore. And with that I refer you to posts on this and previous page: "ALWAYS use 3rd party soft to control clocks, power and fans: OverdriveNtool for red and nvidiaInspector for green; don't use AB - it's shit. Don't use miners for controls."
Why is afterburner shit? give reasons for your statement.
With afterburner you need only 1 programm to controll nvidia and amd. It is easy to use and to understand.
Flash the best settings is the only right way.