The feigaos run at about 80% efficiency, hence the increased heat.

I run a 7XL in both a truggy and a buggy, with an 8XL in a Monster GT conversion and heat is always a problem on long runs. I use the RC Monster heatsink and fans on all of the motors and they still run hot on long runs. What I usually do is to gear to keep the esc in the heat range that I want and then just try to manage the heat on the motor. That's about all you can do. My club runs 30 minute mains, and even during practice sessions, it's not unusual for the motor to get up to 200 degrees F after long runs.

If you have the money and are running a quark or MGM controller, I'd get a better motor. Either one of the Neus or a Lehner, although the Lehners are about impossible to get right now.

The advantages would include much cooler running, a bit more runtime, and a bit more power when comparing a better motor to a Feigao/Wanderer of the same kv rating.

For a truck, I'd stay in the 2000kv range. In the Neu motors, that would put you in either a 1515/1Y or 1515/2.5D. If you went with a 1512, then there is the 2000 or 1900kv models. In the Lehner line (if you can get one) the 1940/8 hi-amp is a hellava motor, from what I understand; although I have yet to get to run one. I've seen the Neu motors in action in helicopters and the power on demand is just phenominal.