While setting up my vega rigs to mine cryptonight based coins, i got so fed up with trying to get wattman and HBCC working with the blockchain drivers. just a buggy pile of mess. In the end i set up 2 commands to run before mining starts on them, using the devcon (MS windows deployment kit utility) to disable and re-enable the vegas (this resets hbcc somehow), and then OverdriveNTool (3rd party utility) to set the clocks, voltages, power levels and fanspeed for each card using a saved profile. i dont even have wattman installed, just the drivers and nothing else.