Alternatively you can disable vsync and get crazy fast FPS... but you may experience problems with WOFF at that speed. Another thing to try is Vsync Fast, but I prefer vsync 1/2 refresh rate, given a g-sync monitor running at 144Hz refresh rate.
Did you set the WoTR Vsync to off, on, or driver setting? Also, did you leave Gsync on or did you turn it off?