Stuttering Issues

My rig:
i7 6700
2x8GB ddr4 (same)
SSD Samsung EVO (no boost, secondary)
GTX 1070 2560x1440 @ 60 (monitor limit)
2 monitors on (only main for play), both as above, and on DP

While FPS is far from max all the time, gameplay is smooth.

Edit:
On Ultra