Keep getting closed crumb on High hydration (85%) dough

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How is everyone doing? My high hydration sourdoughs never seem to get those big open holes in the crumb even with a high hydration like this. I use  350 grams of flour, sometimes I add in some whole wheat sometimes I don’t but no matter what I always seem to get these dense crumbs. For this particular loaf I gave it a 2 hour autolyse, a  1:2:2 levain that more than doubled in 4 hours, 4 coil folds in the first two hours, then bulked for a total of 4 hours. Then I shaped it via stitching and baked it straight out of the fridge after 18 hours. But yet my crumb looks like a much much lower hydration loaf. Any ideas on what went wrong? I may not have scored it deep enough I think my razor was dull but that surely couldn’t be a reason right? Thank you in advance. :) 

To me, that looks like a great crumb; random alveoli sizes and distribution, plenty of larger bubbles.  

If the crumb were any more open, you couldn’t butter it.  

There’s a lot to be happy with in the pictured loaf.  

Paul

Hey Paul. Thank you for the compliment! I just would like to push my skills as a baker and try to get those really airy cavernous alveoli reminiscent of tartine style. It’s not so much about practicality for me. :)