Kombo Strike is Core Offset, MSI uses this on some boards (including mine) and then offers "Core Offset" on others.
What you are posting about is an unstable undervolt:
Combo Strike 1 = -10 CO
Combo Strike 2 = -20 CO
Combo Strike 3 = -30 CO
If your chip isn't stable (it will crash at desktop / idle) then you need to back off and use a lower setting.
Try -20 CO (option 2) and see how it goes, if you still are experiencing crashes then you need to try option 1 etc.
This really just boils down to silicon lottery, my 5800X wasn't able to handle -30 CO, but fortunately my X3D was.