MSI 570 Armor & GamingX 4gb findings and questions

Both have hynix memory

570 Armor 4gb OC Best results came with copying 2:1500 to 2:1625, 2:1750 and 2:2000  I set the Undervolt in watttool to -16 and I am able to achieve 27.2 in smOS, clocks set to 1161/1975  gpu-z shows 114w

570 GamingX 4gb Best results came with copying 2:1500 to 2:1625, 2:1750 and 2:2000  I was not able to undervolt in watttool as everytime I change the undervolt value it goes back to NA  I am able to achieve 28mh, clocks set to 1161/2010 gpu-z shows 94w

Has anyone had any better luck with these cards and if so can you please share settings in polaris.