open crumb and fermentation

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just wondering if anyone knows if a slow fermentation increases openness of crumb. I recently made a oat and multi seeded sandwich loaf (using instant dry yeast) with a 50% poolish and i got a great tasting loaf with an open crumb which i wasnt really expecting as there was butter in it too (although i presume seeds open up crumb too) and i thought the butter would both tighten the crumb as well as tenderizing it.

Im happy with the bread i just want to know if its because of the 14 hour pre-ferment of 50% of the flour. Crumb shot below

but I wanted to tell you that is one nice slice of bread. Looks delicious! Mind sharing the recipe?

Delighted to it's:

night 1

poolish (50% for approx 12-14 hours)

75g whole wheat

105g bread flour

180g water

1/16 tsp instant dry yeast

soaker

25g sesame, toasted

25g sunflower, toasted

25g linseed/flax

75g rolled oats

30g honey

4g salt

120g water 

final dough

195g bread flour

25g unsalted butter

4g salt

3/4 tsp instant dry yeast 

all poolish 

all soaker

crumb butter into 195g flour rest of dry ingredients add in wet ingredients, mix and rest. Knead (however you wish) leave to rise for about 30 minutes, shape, put into tin and proof. Score and bake for 45 minutes at 220 or until done.... everyone has their own method of making and baking so....

When you say knead, can I use the stretch and fold method? I am not big on regular kneading since I seem to mess that up pretty good. 

You let it bulk ferment for only 30 minutes. Does the dough double at that point? Or how much should I let it rise?

What temperature is your kitchen? It is down right cold here so I need to adjust your fermentation times. 

Would this dough be appropriate for Dutch oven baking?

I want to try making it in the next couple of days so I appreciate your responses to my questions. 

No worries it's s lovely bread, moist and creamy from the oats with a slight sweetness  from the honey and an added texture and flavour from the nuts. If you like sweet breads I'd add another 20g honey

very impressive.. have just bookmarked this post.. I'll have to give it a try one day!

Thanks alot it's tasty and something for everyone, lots of room for play in it and was originally a quick bread so no need for poolish just go straight into it...,