https://www.rollitup.org/organics/248826-veganics-dr-vondank.html
^ in that thread the dude uses 75% perlite 25% canna terra...
Maybe that's a good place for beez to start, I'd get a 50/50 mix perlite and organic media if you want to stick to hempy buckets. And yes, bennies are beneficial organism, microbes as such.
I also washed out the perlite, but mine was very fine as opposed to big and chunky, that might have been the issue. Got any pics of your current grow beez? Or any type issues you are current;y dealing with? Also, last question.. hah.. Why are you switching to biocanna, I like the stuff but is the GO line not working well for you?