Oh really? Then please tell us how this works. It seems you´re the only one having luck.
I noticed zero difference in Performance on two rigs updated to 10.3 by today

Pci Bus is shown, it is running so far... but Performance wise 10.3 compared to 10.2 is not a single perctent faster.
Rig Config: 8x Sapphire Nitro+ RX580s 8GB @1175/2225, Win10, AMD Driver 17.7.2, Claymore 10.2 and now 10.3 with same Hash: 31.x/Card or 249,x Total per Rig

cheers