Is my basket too small? How to achieve a good ear?

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Hi Fresh loaf community

I have a few questions on improving my sourdough. I've been baking sourdough for 2 months

I currently am finding that my sourdough is rising above the basket. I'm using a 20cm banneton and photo is approx 9hrs proof in the fridge after bulk ferment

Autolyse 2hrs

Bulk fermentation for 4hrs at 25-27degrees. Performed six sets of stretch and folds. First three 15mins apart then remaining every 30mins

Recipe below

20% / 100g levain

90% / 450g white bread flour

10% / 50g rye flour

75% / 375ml 

2% / 10g salt

I noticed one I took the sourdough out of the basket it begin to expand. What could this mean?

Lastly how do I achieve a good open ear? I think cast iron pot could be too small for my sourdough as I've noticed a crust forming

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The banneton is way too small. Either reduce the weight of your dough or use a larger banneton. The color and blisters on your bread is excellent.

The bread is very close to producing an ear. Keep in mind that boules are a difficult shape to get ears. Batards are much more suited to them.

You are off to a great start.

Despite it spreading a little it baked up really really well.  The profile of the cut loaf looks great to me.

In terms of ears, I agree with Dan, batard by nature are easier to get big ears with than boules.  However, if you are doing a single score, something a little bit more along the midline, blade angled 45* from the dough surface and about 0.5-1 cm depth usually does the trick for me.  This is assuming your dough has good structure and good surface tension built throughout bulk fermentation and with shaping.

Benny 

So reducing the dough weight by 35% solved the basket issue. I followed same method as before except dough had approx 13-14hr proof in fridge

Wasn't able to achieve an open ear. I'm wondering if my dough is over proofed. When I took the dough out of the basket before baking it lost its shape slightly. Is this common. Ideally would like to achieve more of an open crumb. I've attached some photos. Any feedback/tips on improving my sourdough would be appreciated

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 Thanks

Shortening any stage of fermentation will help. The goal is to not exhaust the yeast before it hits the oven. You need to leave some “gas in the tank” so the oven spring can take place in the oven...

Thanks! I forgot to note that proof time in fridge was 8.5hrs 

Do you think there would be different results between shortening bulk ferment vs shortening proof time in fridge?

Normally the fridge time is not sensitive if the temp is 38F or lower.

The shortening of fermentation time is probably best at BF. If you refrigerate the shaped dough overnight you can skip the final proof and back straight out of the fridge.