Just to note on GSM improvement.
I got 60-72 desynthesing Electrum needles & Tortoiseshell Armillae.
The point was to get the get enough demimateria to get all the 7 new master crafter books and an extra 30 fieldcraft demimateria to craft 3 new jewelry pieces.
So I focused on having 65 Fieldcraft I and 35 Battlecraft I

Just a bit cheaper before going to Aetheryte Rings desynths