I did a "batch" yesterday, 5ml first, to going down to 100mg/ml, if it crashes.
I´ve used 20% BB , 5% BA , the rest: 50:50 Sunfloweroil/IPM.
Still holds, the powder was brought into solution, alltogether, by adding some heat with a hair-dryer, filtered through a 2µ syringe-filter into a sterile vial, heated again slightly under a flame to about 70°C and injected today without any problem (until yet)^^.