You Put Your Left Hand In

One allowance here buys 43,600 EXP, the best of the 6 Lv 25 Alchemist tradecraft leves that record EXP: the runner-up manages 36,390 EXP, 17% less.

Across that rung the return runs from 17,310 EXP to 43,600 EXP per allowance — 6 distinct figures spanning 152%, so the wrong pick leaves 26,290 EXP of the allowance unspent.

On whether to wait: the best Lv 30 Alchemist tradecraft leve returns 41,410 EXP per allowance, 5% less than the best on this rung, while the Lv 20 rung behind tops out at 21,600 EXP.

At Lv 25 this data holds 52 leves paying EXP across 2 categories: the 48 Tradecraft ones average 31,772 EXP per allowance, the 4 Fieldcraft ones 204,269 EXP, which puts this leve 37% above its own category's average.

Engraved Goatskin Grimoire ×1 is a Lv 29 Alchemist recipe, 3 steps deep through 4 intermediates, costing 13 units of raw material and 15 crystals.

Handing that in returns 3,354 EXP and 55 gil for every unit of raw material the order swallows, and the tree needs Alchemist, Leatherworker and Weaver.