i7 6700k BUILD. Varied core temps common?

Sumover

Reputable
Nov 10, 2015
10
0
4,510
Build is as follows:
Asus z-170 Deluxe
i7 6700k @ 4.2ghz
Noctua NH- D15s cooler (1 fan atm)
16gb corsair 3000mhz ddr4
Gtx 980ti hybrid (x2) SLI
1300W evga supernova g2

Just put my new rig together and have been stress testing all day. I keep noticing my cores 1 and 2 are always running hotter sometimes even as much as 12C over 3 and 4. Is this normal? I used a half pea size amount of NTH1 in the middle of the cpu and screwed on the noctua...perhaps TIM is uneven due to screwing one side of cooler down first??
the included pics are after 30+ min of prime95 FFT.
seems they arnt as varied as before but still a good 6-7 degree diference between 1/2 and 3/4.....
Should i repaste or is my cpu broken??

Also what about my sensor movement?
bVkkL6.png

Si2Zou.png