Handle with Care

One allowance here buys 54,240 EXP, which places it 5th of the 6 Lv 45 Leatherworker tradecraft leves that record EXP. The best of them, Hold On Tight, returns 137,400 EXP for the same allowance, 153% more.

Across that rung the return runs from 23,080 EXP to 137,400 EXP per allowance — 5 distinct figures spanning 495%, so the wrong pick leaves 114,320 EXP of the allowance unspent.

On whether to wait: the best Lv 50 Leatherworker tradecraft leve returns 334,080 EXP per allowance, 143% more than the best on this rung, while the Lv 40 rung behind tops out at 125,680 EXP.

At Lv 45 this data holds 52 leves paying EXP across 2 categories: the 48 Tradecraft ones average 98,250 EXP per allowance, the 4 Fieldcraft ones 733,026 EXP, which puts this leve 45% below its own category's average.

Peisteskin Cesti ×1 is a Lv 44 Leatherworker recipe, 2 steps deep through 2 intermediates, costing 6 units of raw material and 16 crystals.

Handing that in returns 9,040 EXP and 43 gil for every unit of raw material the order swallows, and the tree needs Blacksmith and Leatherworker.

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 162,720 EXP and 780 gil for the 1 allowance it costs, or 162,720 EXP per allowance.