I just try to use as less solvent as possible, I believe the extra solvent used for tren pellets in because of the excess cellulose from the conversion. Some of the side effects of tren are caused by excess solvents.
The BA and BB are primarly for sterility purposes, so if your working with pure powder I would go with the lower perentages.
Skye or one of someone more inept in chemistry could probably answer the solubiilty question
(did you mean solubilization(ester cleaving) or solubiltity)???