FPS Drops? (PC)

Just copying out my thread opening in case DICE are looking specifically at this thread...

Hi, My specs are:
AMD FX 8350

ASUS GTX 670 2GB

8GB SINGLE CHANNEL 1600 RAM

ASROCK 960GM- U3S3 FX MOBO

I get fps drops in nearly every map I play. This happens on some maps more than others (not sure which ones), but the bigger maps seem to be better. I also seem to get this when there is a lot of action, like a chopper getting close to my guy. Normally my frames drop to ~30, and changing my graphics quality makes no significant difference apart from increasing my max fps. I have tried many fixes-

Core unparking

Disable Turbo Core

Disable GPU overclock

Set Max Fps in game to 59 and 60

Install DirectX in the game files

Punkbuster reinstall and update

Clean driver reinstall

Cable management to reduce temps

Disable Cool 'n' Quiet

Disable CPU thermal throttling

Increase supersampling %

And there could possibly be more that I have tried.

The main cause of this problem seems to be high CPU usage- by checking the PerfOverlay graph, I cant see that my CPU spikes up randomly as one big line, and sometimes the GPU goes along with it, although very rare. These spikes can range to 1/3 of screen height, all the way to the top! Also, when finishing a match, the two usage lines seem to make some sort of weird DNA pattern... but not a problem yet.

If you guys could try and make some optimizations for the client patch that would be great. And obviously if anyone has any potential fixes, please suggest them. I am thinking of trying out the Windows 8.1 preview in dual boot, but I will have to back up my files first.