FPS Drops When Gaming Using BootCamp

Hi all

Recently I have had problems when using my BootCamp partition for gaming. Essentially, the laptop runs too hot and as a result the GPU throttles to prevent overheating, causing intermittent FPS drops to occur which as you may expect mess up the entire pace of the game. This has only begun to happen within the past few months - I have had many months of trouble-free gaming previously on the exact same setup. The fans are running at maximum and core temps tend to be in the 80s, so no luck there. As I have currently tried:

Resetting SMC

Deleting partition and reinstalling Windows

Downloading a fan control app to try and regulate fan speed

Turn off/on Vysnc

Install firmware update for external display

Changing power settings

Changing settings within Nvidia Control Panel

Uninstalling/reinstalling drivers, rolling back drivers, reinstall BootCamp drivers

My current setup is:

Mid-2012 MacBook Pro 15" running open shell with MacBook display off

OS X Mavericks

20" Cinema Display

External SteelSeries Mouse

Steinberg DAC to Genelec 8010 Monitor Speakers

As previously said, nothing in my setup has changed and this problem has only recently occurred. I am unsure why the fans cannot keep the temperature down all of a sudden.

Some help would be great.