Yeah but if I can’t tell the difference its 75 to me. 
What i mean is …
Its technically running at 75 because each eye is getting a different frame (this is where the artifacts and ghosting comes from. and if you cant see the difference between each alternate frame then it will feel like 75.
For some reason in Luke’s Mods I cant see the artifacts at all. But with Vorpx I need to turn TAA off and then its silky smooth.
This also explains Luke’s comments about the best way to minimize the negative effects is with higher framerate. Because the higher the framerate the less difference there will be between frames.