It's safe because I made it, and I'm not some kind of dishonest hacker trying to screw with your registry. You can open the files with a text editor to verify that.
You can try and change the memory voltage. I don't know if it will work or not. Here's where it is when you open the .reg file with the editor.
View attachment 115630
I took the mods I made for you and changed the memory voltage to 1350mV(like a Vega 64). You can try those and see if you're able to OC the HBM2 higher. It would be better if you could probe the card with a voltmeter to verify it actually changed the voltage. But that's easier said then done.
After driver updates just reapply the mod to make sure it wasn't changed or deleted by the driver installer. I also edited in the part where you need to restart your PC after applying the mod. So don't forget to do that too.