Yeah this stuttering is ridiculous when I'm playing with a 970 and an i5 2500k @ 4.3 ghz. I've tried the mipmap change, adaptive full and half vsync through the nvidia control panel, all vsync options in-game, triple buffering via in-game and the ncp, capping my frame rate in riva, nothing fixes it.
If I go near a shadowy tree area and side-strafe, it's just terrible. Ubisoft why :/. It took ages for them to fix it in FC3. It's so startling to go from a fluid 60 fps to stuttering.
Edit: Not touching anything at all except turning on adaptive sync in the ncp has removed most of the stuttering. It's still there a bit, but I'll mess around more with it. So far this is a fantastic game hindered by a little nagging problem.