As I've leveled my crafting jobs closer to the 4-star range, I've used a lot of Mithrie's guides to help get my master books. His guides have also been helpful for the more difficult synth rotations.

Here's a link to his google document that is updated on a regular basis. It has useful macro/step info for each type of synth:
https://docs.google.com/document/d/1flSupEsBo2KK2FhOeuXcxtLe-Dw0guPKBH1E36wyhmc/edit

Here's his YouTube channel, which has a lot of useful crafting vids:
https://www.youtube.com/channel/UC2Fk3wqLllinjwkqYQh6DHQ