[lincpimp]

IIRC the best way to get the heatsink off is to put the esc in the freezer overnight and then a small amount of pressure between the sink and a fet should pop it off. Clean off the glue, and use thermal paste. Not sure of the brand but generally the paste has a better ability to transfer heat than the adhesive. So use anhesive on the 4 corners and paste on the rest. Also a good idea to make sure the base of the heatsink is perfectly flat, so use a good straight file or a piece of sandpaper on some glass. Use the min of paste/glue.