I still recommend - well not me but blurbusters guys - to limit 3 FPS below max framerate in the drivers, enable vsync in the drivers and disable vsync in Future Pinball.
Example: my monitor can do 144Hz, I've limited it to 141 and enabled vsync in the drivers. In FP options Vsync is OFF.
This assumes, as explained in George's tutorial, that your GPU can maintain the FPS. Regardless, even if your GPU can only go to 100FPS (example) then, limit in the drivers the FPS to 97 instead.
So, pick the "heaviest" table regarding resources you have installed, run it with F9 and see how your GPU performs and adjust accordingly.
One thing is sure, there is no need to waste power (unless you want to heat up your room :D ) by have the GPU doing more FPS than those the monitor can handle.
NOTE: This is using nvidia but i'm sure it is the same way for AMD. My monitor is also Freesync but G-sync compatible so YMMV but essentially, do it in the drivers.