Anyone running RX OS with Dagfix fine ?

I have the following setup

BIOSTAR TB250-BTC
6 x Sapphire AMD RX580 Pulse 4GB with tweaked latency FW.

They run stable with the normal RX OS mining ETH currently at 160Mh/S (Undervolt 875mv / Overclocked to 1225Mhz / memory 2150Mhz / Powerstage 7)

But I can't get the machine to even boot with the Dagfix OS.

Anyone who has similar setup can advise please ? Thank you.