I finally got it to work! reinstalled windows 10, disabled updates, changed a bunch of things windows settings and now i have x6 1070's. running, a bit toasty at 65 C... I will keep moving that down, 65 is too hot I think.
OC:
Power Limit: 79
core clock +114
memory clock +650
Has been stable for 2 hours.
Glad to hear that you got everything running smoothly.
What was the issue before that caused instability when you added more than 5 GPU's ?