i'd use no oil in that mix - just BA/BB/EO/powder...
the EO with no oil can react with the rubber plunger in the syringe, however viromone is made this way and not a lot of people have trouble here...
using 2%BA with 20%BB and the rest EO, i'm sure you'll get it to 200 mg/ml with only a little pain...
i have a 100mg Prop/100mg NPP per/ml concoction made with EO and it bloody kills, but i reckon some of this can be curbed by using just NPP