Yeah this is really bothering me.
When i bought the game on Beta release it was practically unplayable, couple updates later and i seen major improvements the game was playable other than these frequent extreme stutters. Then a recent patch fixed it and i was enjoying the smooth gameplay and then out of no where the stuttering came back, its so annoying. I am playing on literally the lowest possible settings getting a steady 60fps with VSYNC and then out of no where frame freeze stutter, horrific.
I have similar hardware to you.
7700, 1070, 16GB ram, and like you, I have an SSD.
I found that LOW settings actually hurt my performance as I assume it made the game more processor reliant.
I changed textures to high, antialiasing to SMAA1X, post processing to high, shadows on low, foliage on low, and the others didn't really seem to matter. Make sure your memory pool is high in the bottom of your settings and change those resolutions on the bottom both to 1024.
Do keep in mind that your processor is beneath the "recommended" specs and maybe an overclock/upgrade could fix your issue if settings cannot.