Performance issue, very bad FPS and FPS drops

I have the same problem..  My specs:

i5 3570k runing on 4.5 ghz

SLI gtx 760

16 gb ram 

im removing the fps limit set it to 60. It is completely solid 60 FPS everywhere except 2-3 places. One of them is near the sea there is supermarket my fps drops to 40 when i get there, second place is the small town which has a lake view restaurants at the dock when i turn my head to there my fps drops to 34, and i cant describe other places but they are specific places. I tested when i get that places both my GPUS are not working at full speed, (like something bottlenecking my GPUS) also i checked my CPU and its not working full either, cores are working like %65-75 and overall cpu usage is like %80.. Now since i have 16 gb ram which are working on 1866 mhz ram could not be bottlenecking.. Im playing this game on 1080p with all maxed out. The funny thing is when i get my res to 1024x768 and all low.. the FPS is not increasing.. (it is increasing but 2 or 3 maybe)

There realy should be a software problem cuz i dont believe i could get 34 fps in this funny graphics.. btw im getting minimum 70 fps on BF4 with all maxed and full AA.. i thought they are both using frostbite 3.. why would i get 34 fps when i could play same engine with average of 75-80 fps ??

note: i realised that SLI was not working well so i fixed the SLI bits to BF4 settings and SLI started to work. but FPS still the same at those places..

eventhough i should be getting 60 fps min with only 1xGTX 760... 

I realy have serious doubts when im buying EA games and it turns out, im always right to be worried.. I had many flickering isues on BF4 and EA didint even fixed it people just found solutions for themselves.. And these games are sold to realy high prices in the gaming market.. EA has the highest values for their games... it is realy dissapointing.