Thoughts:
1. I would want to test more types of ammo. I’d not worry a thing until it doesn’t print FGMM 168’s or 175’s well. If those don’t shoot, those shoot well out of pretty much anything, and I’d think there’s an issue with the setup.
2. Your rifle is brand new. Does it have any gunk in the barrel? Also, sometimes, though usually with stainless moreso than CL, the barrel just needs breaking in.
3. Is your barrel nice and tight? There are times SCARs come with loose barrels. Uninstalling, standing it vertical, and hitting it with a torque wrench would be a good step.
I don’t have a 20 but I have a 17. The 17 shoots pretty darn good.