Sounds like you might be over kneading it before the second prove.
Yeah I know, but I don't do much before the 2nd prove. Just roll the dough into a bit of a sausage and fold into 3rds and plonk it in the loaf tin (as described in Bread Matters book). Maybe I'm just heavy handed?
Could be. How long is your second proof?
@Arducius started
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Sounds like you might be over kneading it before the second prove.