Use 13.12 WHQL Kaapers. To be honest i always thought your firestrike scores look a bit on the low (ish) side as im able to get within a few hundred points (graphics score) of you, yet in other bench threads im much further behind.
I don't like swapping drivers too much as it is a pain going through the registry to change anything up to 55 entries for ULPS.
I have not found a copy of MSI afterburner that will do it for me yet either (the option does not come up where it should be).