Even on single player I can't pull 60 fps without significantly dropping view distance in some of the Bohemia made maps. Like the tutorial one where you're setting up targets at the beginning, I'm pulling 35-40 fps with 33% GPU usage if I use the default draw distance the game recommends even if I turn FSAA and FXAA up all the way. That game is not made for locked processors.

I think you have the best possible setup for it with an overclocked i5, a GSync monitor, and an upper midrange GPU. Dropping draw distance in half on that map gets me to a pretty steady 53-60 fps though.
But then other maps I play are great at 55-60 fps even with the draw distance cranked like ing . And man Arma III definitely has some of the best looking landscapes I have ever seen. It makes Crysis 3 look like . I have only just jumped in a couple of maps to look around though.