Anita,
What size pots are your Brugs in now? Because Brug roots can easily rot if they sit in soggy soil and deprived of oxygen, don't over pot. Move them up to a pots that provide 2" of new potting mix all the way around until they reach their final sized pot. The final pot size should be one you can handle. The bigger the pot, the bigger your Brugs will get and give you more blooms.
You mentioned using bone meal as one of your fertilizers. Don't. Brugs don't like too much phosphate. Their leaves, especially the older ones, will yellow and fall off. The way Brugs grow and produce buds, they don't need bloom boosters which are mostly phosphates. Manure tea is fine, but needs to be applied at least once a week.