| Here is my input: 
 1) I am using A123 2300mAh (6.6v) and 11.5R + Boost. I use spur = 88, pinion = 33, tire = 46, so rollout of about 54mm.  Because I use boost/turbo, so the straight line speed is quite good, but I can only play for about 8min max for all 2300mAh.  For your 7.4v+7.5R, I suggest you can try rollout of about 45-50mm to start.
 
 2) Ususally the front tires are 2mm less than the rear.  So if you use 46rear, you can use 44front. You can play until ~40mm.
 
 3) camber 1 degree (depends on how the front tires are worn), 0 toe is good to start.
 
 4) GTv2.0... depends if you use turbo or not,  but with 7.4v+7.5R, you dont need turbo.  Try normal settings first and make sure your esc and motor is less than 70C.
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