well, why exactly do you have all these, how many monitors are you running, i've asked this before too, but also, some games have issues with multiple gpus and their drivers, making things like your fps drops happen. but really i can't see any reason why you are using all these cards, i'd say to drop to the 1 or 2 cards and see.
also for the psu stuff, cooler master isn't a good brand, but even bad brands sometimes make a few quality parts, and the gold certified is its efficiency not rating, means it maintais i think a 90+% efficiency.