Sourdough not rising

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Hello - my sourdough isn't rising. The texture and taste is great but it expands outwards rather than inwards. Here's what I'm doing:

1. 400g flour, 320g water - autolyze for 45 mins 

2. Add 160g of levain

3. Mix - it definitely feels very wet at this point but I keep going

4. Let rise for 3hrs. It rises quite a lot with lots of air bubbles 

5. Shape and place to prove for 3hrs in a kitchen towel

6. Bake for 25 mins with lid, 25 mins without lid at 475

I think my dough might be too wet? When I take it out from step 5 to put it in the baking tray it's a struggle. The dough sticks to every thing and is very stringy. Could I be overprooving it? 

Thanks for your help! 

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What flour is in the dough?

If rye, then 83% water in the dough is about right.  If not rye, then yes, it could very well be there is too much water in the dough.   (400g H2O/ 480g flour = 0,83 ...x 100 = 83% hydration).  How much salt is in the dough?

Are any "stretch &fold" steps added during the bulk rise to restore the dough integrity?

Thanks for your help!

I'm using hard whole wheat flour. No, I don't have any folding steps. 

I was using this recipe as a base and upped to water content. I'm thinking that if the hydration rate is higher, the fold steps are needed - would that make sense?

I'm tryin again today with 75% hydration and adding folding steps. Fingers crossed!

but I am willing to bet that it wasn't a whole wheat only recipe.  Compare to some of the 100% whole wheat sourdough recipes scattered around TFL  you may have to develop gluten for a few hours before adding the sourdough culture.  I think anything over 65% hydration will require a fold or more as hydration rises.  

I'll cross my fingers too for you and wish you the best.