Manjaro 18 is currently in beta (the XFCE variant at least) and straight up installs on my lenovo 720s which is also a raven ridge mobile laptop. Kernel 4.17 is running fine and in general I would love to use that machine as a daily system. The only thing that keeps me from doing that is this:
Ryzen/Vega Laptop PCIe Bus Error
Would be interested to hear from you about freezes like this.