Tyler,

I believe changing props to control your current load will be of some benifit, because you will not be overheating the motor and the ESC. However, the battery will not last any longer unless you were regularly overloading on your old setup (10x3.8 prop, AXI2208/34, Jeti 8A, 3S TP730 pulling over 12A peak WOT).

You are running around 7-8 amps at 3/4 throttle now. With the proper propeller, you should pull around 8.75 amps WOT (12C, battery rating). That way you can run WOT without damaging any of your equipment. I got you a 9x4.5E and a 8x4E to try.

The big difference is the vertical pullout at WOT... it won't be as agressive. You are just lucky you have not fried that battery already.