oops my bad i didnt see the 100% usage bar. 71c should be fine then at 100% load.
Underscore those way of apply thermal compound is old school and it doesn't work that well anymore on today cpu due to having 2 cores and 4 cores. covering the whole thing can lead to air bubbles between the cpu and heatsink. what you want do do is let the heatsink do the spreading for you when you apply pressure to install the heatsink. I've done a lot of cpu installation and trust me the X method provide the best coverage and cooling. The video below show different way to apply the compound. check it out =)