Woodie is right, about managing energy. A good pilot can get the same performance at the end of flight as he gets at the beginning by how he handles the throttle, but he must have enough energy and enough power at the end of the flight when battery voltage has dropped. The power developed by our brushless motor propulsion systems is a function of the voltage to the motor and the Kv of the motor. So to get repeatable power the voltage must be consistent. Typically, our setups produce more than enough power at the beginning of flight and not quite enough when we have used 80% of the capacity if we don't manage it properly. Scott's setup sounds like he doesn't have enough power when his pack is at 50% of capacity. So he needs a means of converting the remaining energy to work faster. If he goes to a six cell pack or higher Kv motor he will have more power and will need to figure out how to manage it. He can decide whether to manage it with the stick or the Throttle-Tech.
Jim O