The Proper Precautions
Location
Required Items
Rewards
What the allowance actually buys
One allowance here buys 387,820 EXP, which places it 3rd of the 3 Lv 74 Armorer tradecraft leves that record EXP. The best of them, Catching an Earful, returns 791,810 EXP for the same allowance, 104% more.
On whether to wait: the best Lv 76 Armorer tradecraft leve returns 750,330 EXP per allowance, 5% less than the best on this rung, while the Lv 72 rung behind tops out at 698,030 EXP.
At Lv 74 this data holds 27 leves paying EXP across 2 categories: the 24 Tradecraft ones average 514,135 EXP per allowance, the 3 Fieldcraft ones 1,574,264 EXP, which puts this leve 25% below its own category's average.
Bluespirit Alembic ×1 is a Lv 75 Armorer recipe, 2 steps deep through 2 intermediates, costing 20 units of raw material and 41 crystals.
Handing that in returns 19,391 EXP and 78 gil for every unit of raw material the order swallows, and the tree needs Armorer, Blacksmith and Goldsmith.
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 1,163,460 EXP and 4,701 gil for the 1 allowance it costs, or 1,163,460 EXP per allowance.