Not trying to sound patronizing,but are you sure you have water flow going into the WB's inlet (center) barb?
Another good way to make sure you don't have the WB sitting up on the raised edge of the socket is to use a mechanics inspection mirror and a bright light.... angle it just right and you can see all of the way to the core of the chip.
I've removed and replaced WB's dozens of times in the upright position...it has no bearing on the installation. What does come in to play is hose weight and flexibility on the block. Any side to side forces or hose tension is going to screw up your thermal interface with the core.
When tightening the mounting nuts...start out with all 4 just barely threaded on....then alternate tightening each one in a cross ways pattern. Count the turns and do each nut the same until you feel those springs start to give resistance,then give em another full turn and stop. Gently wiggle the WB in a side to side motion... it should move only slightly with just moderate resistance being felt.
Bear in mind I have never installed a maze 3 WB before and I am basing the above on my experiences....it may be different for you.
I have a thermistor epoxied under my CPU so I don't have that anxious "first start up" feeling waiting for the bios screen to load so I can see temps of the chip. Trust me, I've cooked chips with a shoddy installation before..thats a sick feeling.
