Adventurer Bondmate Farming

Q: Why?
A: Dismissing an adventurer bondmate with a flaming heart icon, and with at least 2 other level 5 bondmates attached nets you a level 4 or 5 bondmate. The attached bondmates return to your inventory after dismissal. A level 4 or 5 adventurer bondmate give +5-7 to a single stat, and each adventurer has a unique stat unrelated to their class (i.e. Clarissa gives Strength, Alex gives Vitality)

Q: How?
A: 3 minimum requirements: defeat Helmut, defeat Octonarus, bronze grade. Order does not matter.
For some adventurers this is enough to get the flame heart. For those who don't get the heart, the fastest way I found to farm affection is to fail a single chest, head back to town, and do the tavern conversation if available. It doesn't matter if the adventurer you're farming doesn't show up to the tavern, they still gain affection.
I do this on earth den personally so I can ore farm at the same time.

Q: Is it broken? Should I prioritize this?
A: No, it's a minmax thing. You get some free stats when dismissing for tags.

Q: Who should I affection farm?
Fastest ones I've found, * means heart is instant after helmut octonarus bronze
Strength - Clarissa*, Barbara*, Human-Fig
IQ - Valdor*, Flut*, Elf-Mag
Piety - Human-Pri*, Marianne*, Elf-Pri
Dexterity - Beast-Thi
Vitality - Dwarf-Kni
Speed - Amelia, Philip, Viviana
Luck - Nobody gives luck

Q: Why level 4 or 5?
A: No idea, I've tried a element, type (rival, friend, dearest, etc) matching but can't get level 5 reliably

would you?