Marooned Minnow

One allowance here buys 788,819 EXP, which places it 3rd of the 3 Lv 64 Fisher fieldcraft leves that record EXP. The best of them, Catfish Scheme, returns 1,314,698 EXP for the same allowance, 67% more.

On whether to wait: the best Lv 66 Fisher fieldcraft leve returns 1,334,289 EXP per allowance, 1% more than the best on this rung, while the Lv 62 rung behind tops out at 1,290,063 EXP.

At Lv 64 this data holds 27 leves paying EXP across 2 categories: the 3 Fieldcraft ones average 1,139,405 EXP per allowance, the 24 Tradecraft ones 435,661 EXP, which puts this leve 31% below its own category's average.

Nothing on the turn-in list is craftable in this data: Tail Mountains Minnow ×3 has no recipe here, so 3 units must come from gathering, a vendor or a drop.

The record carries a repeats value of 2. This site reads that as 2 further turn-ins on the same leve — an assumption, because the source data defines no meaning for the field — which would put the ceiling at 2,366,457 EXP and 1,659 gil for the 1 allowance it costs, or 2,366,457 EXP per allowance.