Rebuilding to Code
Location
Required Items
Rewards
What the allowance actually buys
One allowance here buys 1,746,150 EXP, the best of the 2 Lv 84 Alchemist tradecraft leves that record EXP: the runner-up manages 1,086,090 EXP, 38% less.
On whether to wait: the best Lv 86 Alchemist tradecraft leve returns 2,028,020 EXP per allowance, 16% more than the best on this rung, while the Lv 82 rung behind tops out at 1,525,130 EXP.
At Lv 84 this data holds 18 leves paying EXP across 2 categories: the 16 Tradecraft ones average 1,208,414 EXP per allowance, the 2 Fieldcraft ones 2,702,320 EXP, which puts this leve 44% above its own category's average.
Gil ranks it differently: 4,940 gil per allowance is 2nd of 2 on the same rung against 1st on EXP, with the best there paying 4,960 gil.
Saigaskin Codex ×1 is a Lv 84 Alchemist recipe, 3 steps deep through 5 intermediates, costing 34 units of raw material and 71 crystals.
Handing that in returns 51,357 EXP and 145 gil for every unit of raw material the order swallows, and the tree needs Alchemist, Goldsmith, Leatherworker and Weaver.