Sorry to hear about the KA. Yes, I do recommend dividing it in two and I can’t believe you were able to get 4 loaves in your 5 quart. That is impressive. The loaf size is larger and the process recommended is different…but the short answer is yes. You can mix in the porridge, earlier if you want. You may have to mix longer to achieve that gluten development. You still looking to get a really great windowpane. And the dough amount is larger overall, so you still may not be able to get all 4 loaves in.