you may have to measure the base current with an ocilloscope using a current probe (similar to a tong ammeter). The transistor requires a 0.6V signal to be applied to the base to switch it on but if for some reason the circuit resistance may be too low, this will increase the current. This current (base emitter) and the current from the coil (collector emitter), flow through the transistor emitter to ground. Coupled with the fact you are running wasted spark which in theory will double the current may increase the problem a small rise in the base current can have. The ecu should have current limiting resistors fitted to the ignition driver outputs to limit this. Proper testing with the right equipment will be required to prove each circuit is correct.
We run the same ecu/coil/igniter/dwell in our circuit car and have not had an issue.