Don't listen to anyone telling you about how to run brushless, unless you are sure that they know what they are talking about. The LHS is usually the worst place to get brushless advise, especially when it comes to large scale.

The Mamba Max is a good controller. Just don't try to make it do what it doesn't want to. Don't go over 4S lipo. Some will do 5S, but that is pushing it. Stick with two pole motors. The MM doesn't like four pole motors.

If it starts to run a bit hotter than you'd like, try a fan. Fans are good for dropping the temps a bit, but are not a fix or overgearing situations.