I am also experiencing micro stutters regardless if the FPS are steady or not and in all situations. With all possible combinations around Vsync, Nvidia control panel, inspector...I have been trying virtually every advice and combination there is (except the 144Hz Gsync monitor because I do not own one) for about 5 days and the issue just wont go away. My opinion is that the new 1.5 engine still needs more/better optimization and I hope that this will be solved. I expect that with my PC specs DCS runs smoothly...
EDIT: Wow! I am blown away!!! I highly suggest trying out this tip...it solved my micro stuttering issue for a good amount! Happy times :)