Averaging Formula for farm affixes:
Gold Find and Luck : (Hero + Follower) / 2 + Fortunate + Shop Boost + Map Base
Fortunate also optional but once you have it, it has permanent influence. Of course the values from fortunate are above cap like shop boost and legend map boost.
Optional:
- Shop Boost + Map Base
For item drops:
(Hero + Follower) / 2 + Follower Bonus + Map Base + Shop Boost
Optional: + Map Base + Shop Boost .
Follower bonus being the bonus 100% item drops is permanent if you equip hirling but doesn’t appear when you do solo gameplay.
Epiphany increases the caps of the farm affixes but these formula calculation will still be the same principle.