I solved stuttering issue in the following way: set graphics to max (optional), disable ingame fps limit, disable any kind of vsync, set framerate limit to 30 in rivatuner statistic server (installed with msi afterburner). I play in the fullscreen mode with desktop composition disabled (windows aero is disabled too), my gpu is hd 7870.
A game with 3s gcd does not really benefit from fps over 30 - found it out during the video recording and set a global fps limit after that (works well in other mmorpgs too).