Anyone know what do might be happening with my savage?

Recently put another 4 bumpers, totaling 8, but I think it has no connection.

I run with it, no more than 8 minutes and the ESC has already reached the maximum temperature (180-190 º F) and stops everything, having to wait for cool down.

here is all stock motor and ESC ...

The Cooler / fan is working. Does it need a bigger fan / cooler?

All this running on grass, but does it have something to do? I always walked a lot and it never happened ...