I feel like such an idiot right now. Before even reading your post, I discovered my heatsink was indeed mounted 180 degrees from its intended position, and a lip wsa causing to not seat correctly. It has been that way since I got it over a year ago. I have had intermittent problems with it and couldn't figure out why. Before my previous post, I fixed it without knowing it.
I have never been able to get it to run at 133 FSB before, now it is just fine. And the CPU is about 39 degrees, used to be 60.