yeah...no need to "smear" AS5 on the A64 processors. Just put a little "dab" on the center, and let the heatsink do the spreading. When you pull the heatsink off, it will look like a blob of oval, or circle paste in the center, with bare corners. I really don't know if this should cause a 5 degree difference though. The stuff that was on your heatsink (Shin Etsu) is pretty good stuff, so you probably shouldn't have messed with it, if it didn't really need it. After proper curing of AS5, it should drop a degree or two in roughly 2-3 days. I would also experiment with the stock fan, and the one that you switched it out with, to see which gives you better temperatures. I think the stock heatsinks actually do a pretty damn good job, if you're not overclocking.