I recently installed my Maze3 on an XP1500+. Maybe I put it on too tight, but the distance from the block to the nuts was probably 1/4" to 3/8". The springs were pretty compressed. I was using a shim and got temps of about 30C - 35C. When I later took the block off, I could read the lettering from the CPU on the maze3 from the artic silver. Make sure you put that sucker on tight, and if you're using a shim, you might want to try without it. See pics of my system at
www.osthebox.com.