When we say "remount" don't touch the 3 screws on the TR4 socket, you remove the 4 NUTS holding the AIO over the CPU, clean both sides with isopropol alcohol until the are perfectly clean. Then put a very light layer of Thermal compound over the entire CPU surface, then put the AIO back and tighten the nuts. they should not be much more than hand tight.
Edit: crashtech, he does not need to use the back side or any screws, its 4 nuts on 4 studs that are hand tight into the TR4. If you mess with the screws, you are "screwed" as they must be torqued in order with a custom torque wrench. And they are VERY hard to start, I have to use a special screwdriver and push so hard it scares me, after 1/2 turn, I go to the torque wrench.