Maybe He's a Lion

One allowance here buys 480,670 EXP, the best of the 6 Lv 52 Leatherworker tradecraft leves that record EXP: the runner-up manages 264,372 EXP, 45% less.

Across that rung the return runs from 25,691 EXP to 480,670 EXP per allowance — 6 distinct figures spanning 1771%, so the wrong pick leaves 454,979 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 2 categories: the 48 Tradecraft ones average 251,119 EXP per allowance, the 6 Fieldcraft ones 576,023 EXP, which puts this leve 91% 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.