The funny thing is, when I first started my boules were better than my batards, then I got better at batards. Maybe I'm over fermenting a bit because I'm not factoring in how larger, round loaves cool more slowly. Maybe I'm not getting as much tension during shaping.From what I've seen of your batards, I did it hard to believe you're having issues with boules. I've found in my case that the overnight ferment in the fridge maximizes my vertical oven spring.