Maybe He's a Lion

One allowance here buys 480,670 EXP, the best of the 3 Lv 52 Leatherworker tradecraft leves that record EXP: the runner-up manages 182,320 EXP, 62% less.

Across that rung the return runs from 154,140 EXP to 480,670 EXP per allowance — 3 distinct figures spanning 212%, so the wrong pick leaves 326,530 EXP of the allowance unspent.

On whether to wait: the best Lv 54 Leatherworker tradecraft leve returns 560,140 EXP per allowance, 17% more than the best on this rung, while the Lv 50 rung behind tops out at 334,080 EXP.

At Lv 52 this data holds 54 leves paying EXP across 3 categories: the 24 Tradecraft ones average 337,743 EXP per allowance, the 3 Fieldcraft ones 868,208 EXP and the 27 Grand Company ones 177,755 EXP, which puts this leve 42% above its own category's average.

Wyvernskin Mane of Fending ×1 is a Lv 53 Leatherworker recipe, 3 steps deep through 3 intermediates, costing 20 units of raw material and 29 crystals.

Handing that in returns 24,034 EXP and 41 gil for every unit of raw material the order swallows, and the tree needs Goldsmith and Leatherworker.