Regarding stuttering, you might want to not use the games vsynch option (which I know you have off at this time) but your game cards control panel. If under 60 fps, you can use the adaptive 30 if you have a NVidia. I'm not sure what AMD has. Test out some different things.
Typically I use the cards vsynch because it does a better job. In many isometrics even when there is not stuttering and using in game vsynch, when moving/panning the landscape I get a "refresh wave", it's not tearing like a FPS but it's like a pulse wave of sorts often enough. Using HW vsynch takes that away and makes a solid screen for me throughout. Good luck.
