I just want to note that you need 88 smithing and 53 leathercraft to hit T3.
Also desynths were their own category of synthesis in retail, lower success and higher material loss then other lightning/wind synths. Unless of course you did something like fill your moghouse with tarutaru stools for a strong mogenhancement:desynthesis. And their are many desynths that give valuable materials, from the subligar you can desynth thats 8mil for cashmere thread, to beastmen peices for iron/steel/darksteel/gold etc.
I would say ZAM and FFXIAH not having recipes is actually an argument for people just not desynthing it, or not telling anyone else when they did. The one ram leather in the recipe is from memory which is why it has a question mark, I have no way to confirm it, I quit in 2009.
https://www.ffxiah.com/player/Sylph/StormstrifeAh mining in Halvung, those were the days, when finally I stopped getting myself killed in Ifrit's Cauldron so I could die in new and exciting places.