Have you tried setting it back to stock settings to see what happens?
When you are getting the low framerates is your coming out of the down clocked state?
Rig: i7-2600K@4.9GHz | ASUS P8P67 Pro | 16GB Corsair Vengeance 1866 | EVGA GTX 680 | 2x120GB Vertex 3 SSD | 1TB Seagate | Seasonic X-850 | CM690II Advanced | 27" Catleap 1440p IPS (primary) and 23" LG IPS
Cooling: XSPC Raystorm CPU Block | EVGA Hydro Copper full cover GPU block | XSPC EX and RX 240 Rads |
6xAP-15s | Koolance PMP-450 | 1/2" Primochill tubing | XSPC black chrome compression fittings