The Turning Point

One allowance here buys 63,810 EXP, which places it 4th of the 6 Lv 40 Carpenter tradecraft leves that record EXP. The best of them, The Arsenal of Theocracy, returns 102,600 EXP for the same allowance, 61% more.

Across that rung the return runs from 61,560 EXP to 102,600 EXP per allowance — 4 distinct figures spanning 67%, so the wrong pick leaves 41,040 EXP of the allowance unspent.

On whether to wait: the best Lv 45 Carpenter tradecraft leve returns 168,310 EXP per allowance, 64% more than the best on this rung, while the Lv 35 rung behind tops out at 105,270 EXP.

At Lv 40 this data holds 52 leves paying EXP across 2 categories: the 48 Tradecraft ones average 72,545 EXP per allowance, the 4 Fieldcraft ones 560,212 EXP, which puts this leve 12% below its own category's average.

Gil ranks it differently: 658 gil per allowance is 2nd of 6 on the same rung against 4th on EXP, with the best there paying 736 gil.

Garnet Grinding Wheel ×1 is a Lv 43 Carpenter recipe, 2 steps deep through 2 intermediates, costing 7 units of raw material and 19 crystals.

Handing that in returns 9,116 EXP and 94 gil for every unit of raw material the order swallows, and the tree needs Blacksmith and Carpenter.