The Grave of Hemlock Groves

One allowance here buys 256,630 EXP, which places it 3rd of the 3 Lv 58 Alchemist tradecraft leves that record EXP. The best of them, There Was a Late Fee, returns 811,360 EXP for the same allowance, 216% more.

Across that rung the return runs from 256,630 EXP to 811,360 EXP per allowance — 3 distinct figures spanning 216%, so the wrong pick leaves 554,730 EXP of the allowance unspent.

On whether to wait: the best Lv 60 Alchemist tradecraft leve returns 812,920 EXP per allowance, 0% more than the best on this rung, while the Lv 56 rung behind tops out at 534,960 EXP.

At Lv 58 this data holds 54 leves paying EXP across 3 categories: the 24 Tradecraft ones average 443,090 EXP per allowance, the 3 Fieldcraft ones 1,079,567 EXP and the 27 Grand Company ones 228,371 EXP, which puts this leve 42% below its own category's average.

Growth Formula Zeta ×1 is a Lv 58 Alchemist recipe, a single step, costing 6 units of raw material and 5 crystals.

Handing that in returns 42,772 EXP and 68 gil for every unit of raw material the order swallows.

The record carries a repeats value of 2. This site reads that as 2 further turn-ins on the same leve — an assumption, because the source data defines no meaning for the field — which would put the ceiling at 769,890 EXP and 1,218 gil for the 1 allowance it costs, or 769,890 EXP per allowance.