Blimey, 7 degrees difference between cores - I was getting uppity at 5 between Core 0 and 2/3.
That said you're having better results than me, I've got a pretty lame chip by all accounts.
Currently at 1.33750v, 375*8 (aiming for 1:1 400x8 for 3.2) and load temps are close to 68-70. Cooled by a Scythe Ninja Mini in an Antec Fusion case (think that's the bulk of the problem though tbh!)