AWESOME MINER, winmkx.I do not reach 39... but 37.5MH/s per card. Im very satisfied tho, very stable, excellent.
Altough i think you can reach the 39 with my Bios, just play with the powertune and intensity options.
I always see if i can keep the cards at around 60°, wich is the case here.
If you care less about heat or powerdraw.. change the -powertune option to +10 instead of -5...
My Setup:2x Sapphire Nitro+ RX580 4GB (Elpida)
Beta Blockchain Drivers August
mkxMiner 3.0.1 (settings attached below)
Custom Bios (attached below)
Launch Paramssetx GPU_FORCE_64BIT_PTR 0
setx GPU_MAX_HEAP_SIZE 100
setx GPU_USE_SYNC_OBJECTS 1
setx GPU_MAX_ALLOC_PERCENT 100
start "mkxMiner // XVG Verge-Lyra2REv2" mkxminer.exe --asm -o stratum+tcp://xvg-lyra.suprnova.cc:2595 -u LOGIN.WORKER -p x -I 23 --powertune -5,-5
My Result37.5MH / 37.5MHDownloadsBIOS:
https://mega.nz/#!UfxiwY4R!yozA4ycJxPFLdVBVjxuef6f0UyizNFX4Zm292aJJ50cConfig:
https://mega.nz/#!IDoUWbiI!1BgltwiVqB6r83mKf7v9gOuePTdGTODnTOjNatqWtlcHappy? Buy me a beer! 
XVG: DKnh9od5rYvcqT4dZ7LiMn5m8FXwb1YGB1
ETH: 0x8Cfa834a62d54a56892E62e512943d566d7ccF8a
ETC: 9aD6E4cb7DE3A7642a5D70dd90cb0900fdcB7505
Cheers... and enjoy!