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I have never used MX-4 but most pastes have a "burn in" period after which they will perform better. Try running OCCT (or similar) over night and see if the delta drops.
Also, I have never seen it recommended to spread. You are more likely to get bubble IMO. I always put a dot (or two) centered over the die and let the pressure of the heatsink spread the paste.
If it's a heatpipe cooler, draw a fine line between each heatpipe with the TIM. That's how i had to apply the MX-2 with my DK. Had great temps since.
If it's direct pipe some people put a line down each heat pipe.
damn it!, cleaning thermal paste from direct heatpipes is a pain in the ***!