Production parties for Potion Making

Does anyone have any information on how high rank potion making affects production parties when you are making potions? It just seems odd. Unlike carpentry or weaving, etc, the success rate for potion making seems only influenced by production mastery. (Just talking about the party itself, not things like rain or Mondays.)

For example, my friend is r6 Potion Making. When he joined my party I only got a 1% increase (due to his production mastery rank.) Would a higher rank be more effective, maybe r1 or master title?

It's 1% if he's lower rank than you. 5% (of normal %) if he's similar rank or higher. Been potion making for a long time. This is how it works. Also keep in mind people on pets and other etc.

AWESOME. Thank you!