Starting torque takes more current and low ESR. Look at the voltage drop on your driver and consider better drivers. For BJT drivers, a current gain of 5 was normal and 10 was good. For fast switching of MOSFET the current gain of 50 is normal , and 100 to 200 is good and maybe more in IGBT. Even though static gate current is low. Switching current is high on gate due to capacitance
Without full disclosure of design details and test results, I can only guess.