When to use Beastie Bloomz?

Yo, what’s good people!
My first Grow here. I’m on week 4 of flower.
I want to know if it’s time to use Beastie Bloomz? Or can I use Open Sesame?

I have not used any PK booster yet. I have not used Open Sesame or Beastie Bloomz yet.

Look at the top of your tallest branch, then from the very top, look down about a inch, and when you can no longer see the stem in that 1 inch area, begin using Beastie Bloomz, every other watering...

I'm gonna steal a line from another member, if the nutrients you're using did half of what they claim, why would you need extra? besides, no plant needs that much p/k. but you already bought it and you'll probably still use it and then your leaves will turn yellow and die. good luck though.