Rye Porridge levain

I tried the Rye Porridge bread from Tartine 3 the other day. I like this bread a lot - it provides a very nice sour-ish rye flavour with the texture of a good wheat levain. Very moist crumb and the bread benefits from sitting for 24 hours before slicing it. I followed the recipe but did not add any nuts or nut oil as Robertson makes them optional and I don't particularly like nuts in my bread. I also changed the method. I was not having much success with Robertson's methods (room temperature bulk ferment with a long shaped proof in the fridge; always over-proofed).