I am not a chemist but I believed I listened to people were adding the BA straight to the nic base without making a different solution initially. I would look into benzoic acid solvents, solubility, and also saturation degrees (in numerous carriers/solvents), as well as consider one of the others, for additional experiments.
http://johnathangchn941.raidersfanteamshop.com/the-most-effective-economical-e