Update 09-OCT-2017:

For the moment I've reached stable performance with the game.
Game caused GPU going into high boost on clocks and software could not keep up ending up with crashing the system.
For my GTX 1070 vBIOS update helped following the link:

https://forum-en.msi.com/index.php?topic=281873.0

Keep in mind that this is for GTX1070 mobile and this is on ones own resposibility, the safest way would be to contact the retailer.

After the vBIOS update clock boost is limited and is not causing crashes. On 1 hour gameplay I had one crash without the usual event logs, after I turned Gsync off I had no more crashes for the following 2 hour gamplay [full screen on ultra].

Currently I'm on Nvidia driver: 385.41-notebook-win10-64bit-international-whql.

Cheers,