At this point your CPU is almost certainly the limiting factor, and there's little you can do about that (except overclock it, if you have the know-how). You should definitely have room to increase your graphics settings, even though image quality and texture quality are the most important ones for making the game look nice and you've already got them fairly high. It's unlikely you'd notice higher textures on a 1080 monitor unless you zoomed in a lot.
Turning down/off physics will slightly improve CPU performance. In-game AA is demanding, but if your GPU has that much room to spare it probably doesn't matter.
IMHO, GTX 960 is barely an improvement over a decent running (& clocked) 660 Ti.
Ok thanks for your input guys, I guess I'll just stick with the rig I have then with a GPU that doesn't max out, with a processor that ranks fairly highly for this type of game (single thread) and already using NVIDIA which seems to work better than AMD.
Overclocking and turning off physics then I guess if I want to try something, and maybe trying AA off. What does the setting physics do?