Sounds Fishy to Me

One allowance here buys 141,630 EXP, the best on the Lv 20 Fisher fieldcraft rung — matched exactly by 1 other leve of the 4 there, with the rest trailing at 84,978 EXP or less.

On whether to wait: the best Lv 25 Fisher fieldcraft leve returns 255,336 EXP per allowance, 80% more than the best on this rung, while the Lv 15 rung behind tops out at 98,039 EXP.

At Lv 20 this data holds 52 leves paying EXP across 2 categories: the 4 Fieldcraft ones average 113,304 EXP per allowance, the 48 Tradecraft ones 17,352 EXP, which puts this leve 25% above its own category's average.

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

Quarrymill, South Shroud issues 50 leves in this dataset, Lv 20 through Lv 30, across 4 disciplines.