motor temps? help
 

I fly about 8 minutes and the motor isn't hot to the tough but after about 5-7 seconds it becomes pretty hoy. I know motors are made to operate at about 150 degrees or so but i want to know if I'm in a good range. What is a good rule of thumb to stick too?

Its a scale trex 500e in a fuselage , 1600kv align motor, 12t pinion, 162t main, 100amp esc hobbywing, flying PC is at 50,50,50,75,100 and TC 85% across. Hiw can i get temps dowm. Mechanically set -3,0,+10