The largest problem in early combat career of the 163 was, to my understanding from the writings of 163 combat pilots, was the ground controllers. They were used to the much slower traditional fighters, and could not adjust to the amazing climb rate of the rocket fighters. Therefore the ground controllers usually failed to direct the rocket interceptors to their targets - and given the limited amount of fuel, the interceptors didnt get another chance. The development of both the plane and the tactics is unique, fascinating story, really.