Try to cross drivers for RX4XX and RX5XX? ( it's 15.xx and 17.xx, can't find exactly which one it was).
If You do and it didn't work, Try 16.9.2 driver or the new AMD blockchain driver.
Tried what you suggested and no dice.
My rigs have done the newest windows 10 update - the creator update - and since then they have been stuff.
I'm getting the normal error now of 'this device doesn't have enough resources, you must disable a different device blah blah