First off you might need better circulation in case, or you might have too much arctic silver. You just need enough to make the thinnest of coats that will make both parts touch better. With too much you get a thermal layer built up in the paste, and that can lead to poor cooling. Tbird's run hot anyway. Up to 50C under full load with stock heat sink. But you should definately think about getting rid of that orb, no one seems to like it very much for serious cooling. If you are serious about cooling, think spending a few more dollars and invest in a water cooling system. I dont think anything without a peltier can compete with a water cooler, even a room temp water does better than any heatsink/fan combo and any efficient heatsink/fan has the downside of sounding like a jet engine
Good luck man!!! Overclocking is a blast!!!
Wow just looked at your rig. Nice setup!!!