M-6827 T5750 throttles at 80*C?!?

So do i need a brand new heatsink or just wait for my Penryn to come in? I picked up a T8300 (2.4Ghz) and they're supposed to run a lot cooler and a lot faster. I know the t8300 is 45nm and the t5750 is 65nm.

Anyway the heatsink isn't transferring the heat to the heatsink very well at all. The heat coming from the fan is cold. It idles at 65*C and throttles back to 1Ghz after 5 seconds of 2Ghz load when it hits 85*C+. The thermal max according to intel is 80*C. So that would explain throttling. The Penryn core however says a thermal max of 100*C. So I will be able to run full load for a lot longer on the Penyrn however. I want to fix this heatsink issue. Should I buy a new heatsink? I lapped the cpu and the heatsink in an attempt to improve temps with no result. Freshly applied thermal paste and used 90% alcohol on surfaces.

So isn't unusual that the heat is not transferring to the Aluminum heatsink? It's copper at the core contact to the copper heat pipe. Then it goes to the Aluminum heatsink which never gets hot at all. It's always cold to the touch. I can feel the heat transfer about 1-1.5" up the heat pipe then it goes cold before it hits the heatsink.

What should I do?

*UPDATE*

Ok so I had the fan plugged in and turned on intelburntest and in about 2 seconds it hit 83*C and throttled back to 1Ghz (minimum multiplier). The heatsink never got hot. The heat pipe got really hot. Then I unplugged the fan and turned on intelburntest and waited. After 30 seconds the heatsink got smoking hot. The cpu was at 83*C and throttled back to 1Ghz.

So, I think the heatsink is faulty. On every computer I've done the heatsink gets real hot and the air coming out is really hot continuously. The thermal conductivity of the stock heatsink is complete crap.