Organic bloom booster

i use banana FFJ KNF style. just mix banana with brown sugar add a tea spoon to water.

I see you all ready use Gaia Green Power Bloom, it was going to be my recommendation. Compost teas are also proper. Power Bloom is not to high in Potassium and Giais Soluble Seaweed Extract is a great source as well to add in with bloom. you should link your question to its diary so others can see whats happening in it. Another option you can try is black strap molasses every two weeks as a bud booster. one teaspoon or tablespoon per gallon. it has some amino acids and potassium as well and simple carbs aka sugars. Happy Growing!