The timings are set to 16-18-18-36, these are the xmp timings of this kit, so I guess they're ok.
Yeah, I'm waiting for a response from Asus, this usually takes a lot of time..
Problem is I read from a lot of different guys that have 64GB of RAM working on higher speeds with their new Ryzen CPUs and x570 MBs (also on C8H). That's why I'm starting to think that my MB is a bit faulty.