there are two kinds of kool bloom, with two different npk ratios and two
different applications.
the powder, which is what you are referring to, is a 2-45-28 that causes
the plants to finish faster because of a stress response. you would use
it in weeks 7 and 8 on a 9 week flowering variety.
the liquid, which OP is using, is 0-10-10 and is used from the start of 2nd
week of flowering through the sixth week on a 9 week strain. i would stick
with the liquid and forgo the powdered kool bloom for an autoflower.