Motor Help

I need help. I have a hyper 7 with a mm speed control. I have two 5000 4s trues rc lipos and an 8000 4s true rc lipo. I had a feiago 7xl that I fried yesterday. My question is this, My buggy will see track duty mostly. My track that I race at has a fairly technical setup and the straight is 110 feet. The problem is the main is 30-35 minutes long!!!!! I need help in finding the right motor to run this long and be reliable, any suggestions?

Here is a link to the track.

http://hobbiesextreme.com/7.html