Simple as Salt

One allowance here buys 2,953,920 EXP — the identical figure every one of the 2 Lv 86 Fisher fieldcraft leves pays, so on this rung the turn-in and the walk are the only things that actually differ.

On whether to wait: the best Lv 88 Fisher fieldcraft leve returns 3,242,290 EXP per allowance, 10% more than the best on this rung, while the Lv 84 rung behind tops out at 2,702,320 EXP.

At Lv 86 this data holds 18 leves paying EXP across 2 categories: the 2 Fieldcraft ones average 2,953,920 EXP per allowance, the 16 Tradecraft ones 1,557,007 EXP, which puts this leve 0% above its own category's average.

Nothing on the turn-in list is craftable in this data: Saltsquid ×9 has no recipe here, so 9 units must come from gathering, a vendor or a drop.