I FOUND IT! 3420 is the Perception you want for your MIN/BTN retainers!

[Caimie_Tsukino]

Data on Fisher Retainers:

2320 perception:
15 lvl 83 Spiny King Crab
12 lvl 84 Dream Pickle
7 lvl 86 Protomyke #987
12 lvl 87 Grey Mullet
9 lvl 88 Shallows Cod
9 lvl 88 Rummy-nosed Tetra

2342 perception:
15 lvl 83 Spiny King Crab
15 lvl 84 Dream Pickle
7 lvl 86 Protomyke #987
12 lvl 87 Grey Mullet
9 lvl 88 Shallows Cod
9 lvl 88 Rummy-nosed Tetra

2362 perception:
15 lvl 83 Spiny King Crab
15 lvl 84 Dream Pickle
7 lvl 86 Protomyke #987
12 lvl 87 Grey Mullet
12 lvl 88 Shallows Cod
12 lvl 88 Rummy-nosed Tetra

... So the optimal perception appears to be somewhere between 2343 and 2362. Once again, just need Grade 8 or lower materia. No Grade 9 / 10 materia needed.

[Roth_Trailfinder]

2342 perception:
15 lvl 83 Spiny King Crab
15 lvl 84 Dream Pickle
7 lvl 86 Protomyke #987
12 lvl 87 Grey Mullet
9 lvl 88 Shallows Cod
9 lvl 88 Rummy-nosed Tetra

2362 perception:
15 lvl 83 Spiny King Crab
15 lvl 84 Dream Pickle
7 lvl 86 Protomyke #987
12 lvl 87 Grey Mullet
12 lvl 88 Shallows Cod
12 lvl 88 Rummy-nosed Tetra

.

Does this not imply that you need More than 2362 Perception? I’d expect 15 fish for the last two, not a cap at 12.

[Caimie_Tsukino]

Does this not imply that you need More than 2362 Perception? I’d expect 15 fish for the last two, not a cap at 12.

Oh, you're right. I wasn't thinking straight. But i have no intention of adding any more Perception, as I have pretty much hit the ceiling with Grade 7/8 materia. If I want anymore perception, I would need to remeld the mainhand, and overmeld with Grade 10/9. Not worth my materia to do this test.