Switching over to Botanicare Bloom and wondering since is supposed to be organic, if normal PK boosts like kool bloom will work or, do I need some other organic PK booster?
You should focus on your NPK ratio. Use
this spreadsheet to figure out the ratio from whatever you're mixing together. Change the mix to get different ratios.
Basically, finishing at 1-2-1.5 is good. You could increase P to get 1-3-2 once or twice near the end.
You just need to be careful with following labels and using a PK "booster" with a product like Botanicare Bloom Pro (Soil) which is already a whopping 1-4-5 ratio. (You'd want to mix that with the "veg bottle" to get something more reasonable.).
Try to avoid relying on "this bottle and that bottle" and be in control of your ratios. (The ratios I use are in my sig.). The typical range is 3-1-2 in veg to 1-3-2 in flower. Anything between those is good. I do 2-1-1.8 in veg, and finish at 1-2-1.8 in flower.