i just desynthed 100 Bridesmaid's sandals which resulted in 29 master III's, i think the rate is around 25% but i just sell the excess i don't need atm for a nice profit

there are several good items for Artisan's spectacles imo like Spirits of Salt, Silver Brocade, Rosegold Cog and Darksteel Hook. With the buff to gathering that is Bountiful Harvest II you'll get at least 24 items from a timed node and most of them have a higher natural yield anyway. Like we can craft 15 spirits of salt an hour on the timed node because we can gather 30/42 Volcanic rock salt an hour and this is the roughly the same for all items