Well the thing is that the framerate without Vsync seemed to be constantly above 60 in the same scenarios (70-90 FPS), but now I can't even reproduce the same effect with Vsync after the new patch. I'm gonna guess the streaming was part of the problem and the small delay caused the display to constantly go to 30 (Maybe I should've measured frametimes instead to see what was going on). I went ahead and enabled Triple Buffering anyway and it seems pretty smooth so far.That's what V-Sync does... it keeps the framerate locked to a multiple of your monitor's refresh rate, if it can't maintain 60 it drops to 30. You alleviate this by turning on Triple Buffering.
EDIT: The Triple Buffering option wasn't there before the patch was it? Better than relying on the control panel I guess.