Not sure if anyone keen on serious OCing has heard, but Ryzen CPU's should NOT be delidded: they're soldered.
from the GURU3d reviews conclusion page:
Delidding Ryzen - somebody is bound to ask it hence I'll address it right here and now, but delidding the processor will not be possible for the simple reason that there are sensors on the heatspreader. Delidding the processor would break it.
part of what they call the SenseMI, as far as I understand.