Thermal detonators in the First Order Galactic Challenge?

Finally got the thermal detonator feat after a l9ng long battle using a g9 zam. Ran jkl lead wat thrawn zam plus 1 tank. I used jml as the tank as his ability block and cooldown reduction came in handy for reducing the chance of an aoe killing zam. I wish they could implement a counter for feat, having to keep track of the number of thermal detonator applied attempts in my head is irksome