best gearing for my hvmax 6.5 on my emaxx 3905

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hi guys, need your opinions on what gearing should i use on my novak hvmax 6.5 motor on my emaxx. ive been using a 4s lipo.. i have also a 65t and 68t spur. and a 12t, 13t,14t, 16t pinion gear. what i want on it is torque, and cooler motor after an 8-10minutes runtime.. and of course, wheelie.

any of your serious suggestion will highly be appreciated!