I've had pretty good luck with the Electrum Needles. They are high enough level to give Fieldcraft 1's either one at a time or groups of two. I usually gather up the 100 Electrum Ore, 25 Basilisk Eggs, 400 Wind Shard, and 125 Fire Shard required to make 25 Electrum Needles(takes less than an hour). Out of the initial 25, I'll get enough mats to make 10-12 more, then enough to make 4-5 more from those 10-12. Total desysnthesis of about 40 items will yield 8-10 Fieldcraft 1's.

HTH

Chiisai