Buttermilk Multi grain with Rye starter / YW fed

This is based originally on a Buttermilk Rye that David Snyder posted. He got it from a baker on the net. I’ve changed a number of things but want to give credit for the idea .
This is another mostly hands off formula. The incredible outcome belies the easy process. This once again proves time and fermentation are your friends .
2150g dough 2 boules 450 /20 min covered graniteware
400/30 min uncovered
levain: 110g freshly ground rye sourced Breadtopia