My setup is in a RC8 buggy, and i think that the electronic is little tight in a buggy, and the air flow arround it is near to be innexistant.
When my same setup was in my Mugen truggy, with near 3 pounds more, my NEU motor and MGM controller was cooler than it is in my buggy

I've run my RC8 this week-end on pavement, and in a realy hot 92 degree ambiant temperature, my motor was 133 degree and controller 135 degree. My li-po was 110 degree.

find it little high, but i had no cooling hole on my RC8 body

Now i've completly remove the front window and make 3 bigs 1/2 hole just behind the motor and ESC with my body reamer.