With the new version you can check everything. Put everything on true and he will mill all your herbs and you still have the option to put some herbs on false to keep them.
milled around 60 stacks, worked flawlessly and much smoother than previous versions. It randomly stopped after 4 mills with the message "Stopping Because Free Bagspace" i had space but it was in an inscription bag and proffesion bag space don't seem to be recognized by HB, so maybe that was it.. But after that it milled green tea and silkweed perfectly.
Great work!
EDIT: BTW you forgot to add Desecrated Herb (Desecrated Herb - Item - World of Warcraft) not very important, but milleable none the less.