I9-9900K / GTX 1070 on my side and I tend to disagree. At least at 1080p.I have a similar PC spec, what I suggest is to use NVIDIA Launcher and the use the optimize button.
If you run offline you need to put all to low essentialy ( if you run with rain and 30 AI)
if you run online you can increase to quality.
But generally speaking the GTX1070 cannot do more than that..
I think many people here underestimate the importance of a very potent CPU which is needed in ACC.
Most settings at high/epic and I noticed no dips under the 60 FPS mark. (Vsync on).