Does my Razer Blade 2018 support Gsync on an external monitor

Hi all, I am having serious issues getting my Asus PG278Q external gsync monitor working with my 2018 Razer blade advanced (with the 1070 max q gpu). So my question is does my laptop/gpu combo support gsync on an external monitor when using the displayport port? If I plug the monitor into the display port the monitor appears in both the intel control panel and sometimes it may appear as a gsync compatible monitor in the nvidia control panel, but i cannot whatever i do get a signal to it, ie the screen is always black. I have now tried 3 cables.It will sometimes crash if i try to span or mirror to the external screen meaning a hard reset of the laptop required. Using the monitor attached to the thunderbolt port has also been a nightmare, with many crashes, corrupted screens and now after a bios + ec update (neither of which were available on the downloads page) and a complete reinstall of windows i can get a signal to it, obviously no gsync this way but for some reason at first it wouldn't run at anything over 60hz, then it wouldn't work over 120hz, finally allowing me to use it at 144hz but when trying to game I am getting abnormal erratic performance, lag etc. The monitor works perfectly otherwise when attached to a desktop pc. Any help would be appreciated.