Try disabling SLI perhaps? I'm using a 980 Ti and got everything maxed out, FPS is fantastic for me.
I have every singly option on and maxed and on 1.06 I get 84FPS on average at 1440p. 1.07 is 40fps. Disabling SLI keeps it at 40fps, so the patch somehow broke scaling and something else.
Tried clean installs of 1.07 , and various NV drivers, 353.06, 353.30, 353.38. 353.49, and the new 353.62 all without success in 1.07. The game also crashes constantly.
No issues on 1.06, so I'm hoping these listed performance fixes in 1.08 sorts it all out.