A Greater Grimoire
Location
Required Items
Rewards
What the allowance actually buys
One allowance here buys 1,087,990 EXP, the best of the 3 Lv 76 Alchemist tradecraft leves that record EXP: the runner-up manages 831,370 EXP, 24% less.
Across that rung the return runs from 498,820 EXP to 1,087,990 EXP per allowance — 3 distinct figures spanning 118%, so the wrong pick leaves 589,170 EXP of the allowance unspent.
On whether to wait: the best Lv 78 Alchemist tradecraft leve returns 1,201,060 EXP per allowance, 10% more than the best on this rung, while the Lv 74 rung behind tops out at 937,250 EXP.
At Lv 76 this data holds 27 leves paying EXP across 2 categories: the 24 Tradecraft ones average 754,791 EXP per allowance, the 3 Fieldcraft ones 1,812,275 EXP, which puts this leve 44% above its own category's average.
Zonureskin Grimoire ×1 is a Lv 77 Alchemist recipe, 2 steps deep through 4 intermediates, costing 27 units of raw material and 46 crystals.
Handing that in returns 40,296 EXP and 170 gil for every unit of raw material the order swallows, and the tree needs Alchemist, Goldsmith and Leatherworker.