I use all 3. As flowering progresses I slowly cut back on the grow and I add the amount I cut from the grow to the flora bloom. Mostly I follow the instructions on the bottle, cut it by 50% of what they recommend, and amend the grow/bloom as mentioned above as flowering progresses. My last feed will be zero grow all Micro/bloom. I max out at about 800ppms with the autoflowers.
I'm not positive, but I believe koolbloom is a pk booster to be used in addition to florabloom, not as a replacement. Like I said, not positive, but it's something you might wanna look into further.
I will for sure, thanks