I'm going to return mine in 2 hours. I'll let you people know what the result is. If I don't have any luck, I'm going to call Apple.
I may end up getting one of the previous generation machines. I don't remember people complaining about uneven temperature on those machines.
Read my previous display model check post: I tried a mid. 2012 model and it suffered the exact same uneven temperature plague. So don't put your money on that one.