Spellbound

One allowance here buys 812,920 EXP, the best of the 3 Lv 60 Alchemist tradecraft leves that record EXP: the runner-up manages 428,540 EXP, 47% less.

Across that rung the return runs from 225,670 EXP to 812,920 EXP per allowance — 3 distinct figures spanning 260%, so the wrong pick leaves 587,250 EXP of the allowance unspent.

On whether to wait: the best Lv 62 Alchemist tradecraft leve returns 595,710 EXP per allowance, 27% less than the best on this rung, while the Lv 58 rung behind tops out at 811,360 EXP.

At Lv 60 this data holds 27 leves paying EXP across 2 categories: the 24 Tradecraft ones average 415,953 EXP per allowance, the 3 Fieldcraft ones 1,098,783 EXP, which puts this leve 95% above its own category's average.

Koppranickel Index ×1 is a Lv 61 Alchemist recipe, 2 steps deep through 5 intermediates, costing 35 units of raw material and 28 crystals.

Handing that in returns 23,226 EXP and 71 gil for every unit of raw material the order swallows, and the tree needs Alchemist, Blacksmith, Carpenter, Goldsmith and Leatherworker.