I've found that for GSM desynth 170+ the old Doman accessories are a really good way to get levels if you have extra Centurio seals. They are only 25 seals a piece, very cheap and an excellent way to get battlecraft 3s. At around 170 my chance was about 60% with HQ bacon/calm.

As others have mentioned the blue scrip gear is good as well. I've been desynthing the Landmaster's Earrings as they're cheaper to get than Handmaster's. You can get a ton of blue scrips from the new diadem. You can also farm Eventide Jade/Periwinkle for the receipts while waiting for pops on Morel, Cuprite, etc