Thanks, that did the trick!
There was no simple 'change to XMP setting' though. For those wondering how to do this on the ASUS BIOS, I found this:
"1. Set「Ai Tweaker」-->「Ai Overclock Tuner」to 「D.O.C.P.」
2. Set「Ai Tweaker」--> 「DRAM O.C. Profile」to 「Profile#1 or Profile#2」，and then press F10 t0 save and exit. "
In my case there was a Profile#0 that I used.