Framerate problems with GTX 760 GPU

I just bought the game, and have sank in about two hours and have thoroughly enjoyed it, love the concept and how the game works and feels. However, the constant frame rate drops are ruining everything. I have a Super Clocked EVGA GTX 760 GPU and an i5 4670k (Not OC'd) with 8 Gigs of ram. I get 60 FPS in menus, however whenever I am standing next 6-8 other players, the framerate dips from 60 to somewhere between 30-45 FPS. A couple of times they have dropped to 20 FPS but that is a rare occurrence. How do I tweak the setting so I atleast get 60 FPS? I have everything on low and resolution at 720p and I still cant get a constant 60 FPS, frame rate moves between 45 - 60 FPS, almost never steady. What gives?

I accidentally posted this on New Players Forum. Sorry about that.