I don't use VR either, but I have to have V-Sync on otherwise I get screen tearing while using TiR. Even with the sttutterrssss my frame rate is a steady 59 which is more than smooth enough for game play and my monitors refresh rate is 60Hz. To clarify somewhat the stutters only occur when looking around while in pit, it happens at random times not related that I can tell to large cities, spawning objects, multiple aircraft in the vicinity, etc. So this leads me to believe that the likely culprit causing the issue is TiR.
Will need to do additional testing/tweaking to verify my assumptions.