You dont, with tren ace either. Some people use default numbers from the steroid calculator even when it is not necessary. Like test prop for example...it will hold at 100mg/ml with 2%BA and 3%BB, but most people insist on adding much more BB. I see a lot of discussion about carrier oils, which one is better, thinner, had omega 3 blah blah, but they never consider that jammin 20% of an irritating chemical is worse.
Anyways it is all personal preference and in this case I added the little amount of BB in case the hormone had crashed. It held with the refilter and the BB.