I've been grinding the numbers and running various tests and the conclusion I'm coming to is something I suspected would happen when three star released. As the item difficulty goes up Ingenuity (1 and 2) become less valuable and effective. And as the progress required goes up, Piece by piece becomes more valuable. I believe this is the the break point where my MaMa+Careful Synth rotation falls behind a MaMa+PbP rotation. I've tested both out and fundamentally as people highlighted in this thread MaMa+PbP goes exceptionally far without requiring more craftmanship. I'll be posting the variation I'm using sometime tomorrow. Looks like if you have max CP (I imagine if you're doing 3 star you're pretty darn close) you can easily fit in two 18 point precise or one precise and Innovate. You nip this in simply by flipping the last SHII to SHI. Outside of that I don't think there are any other changes to be made. Though I do prefer doing the careful synths immediately after WNII.
I'll see about recording a video this week showing this method on some three star items. Though I'm fairly certain no one in this thread actually needs to see said content lol.