What is with the frame rate adjustment?

[Blazing Phoenix]

Ok, so a few days ago I realized I could change the frame rate for myself to make the arrows more smooth. Sounded like the best idea ever so I crank it up to 60 from the 30 I've been playing on for the last 9 years. It seems fine at first except that my accuracy plummets and so I fiddle with it, moving it up and down over the next few days, always being uncomfortable. Yesterday I tried to start small and start at 40 and move up from there every couple hours in order to get used to it. This seems to be working until I realize it's not. Just as a test I move it back down to 30 and immediately I am performing back at my skill and accuracy level from last week. wtf? What is with this. I know I'm just not used to it, but I really don't see how some people on here can play at 60+ fps and be accurate. For some reason, I am most accurate at 30. Maybe my eyes are just adjusted to it.

What do you all think?