Well the second two loaves are definitely better than the first.
1. What kind(s) of flour are you using?
2. When you say feeding, are you in fact doubling?
3. Where and at what temperature is your primary ferment taking place?
4. How cold is the fridge?
Starter should be active enough to bake in my opinion. the good news is it gets stronger with time. Store bought is sometimes somewhat fake, I have seen where some add vinegar to give the bread the sourdough tartness.

Best
Dutch
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