Try if you want to change the memory/GPU clock from Wattman (AMD settings) and see if you see any improvement on the hashrate before you go back to any previous drivers. That way we could compare and see any improvement on the driver's DAG issue
I don't think this driver (17.7.2) does solve the DAG issue, it's probably the next driver that will do that. It should be released in the near coming weeks.
I will go back to 17.7.1 for now.
Edit: I played around a bit with the memory clock, There isn't much of a difference.