Holy Oven Spring, Batman!
Thanks to a combination of techniques learned here (better kneading, shaping and slashing, esp.) and (maybe) a new baking stone, my oven spring keeps getting better and better. Last night I baked a simple 25% WW loaf. After proofing my shaped oval loaf for 4.5 hours, I put nice long slashes mostly-lengthwise acroos the loaf and the cuts immediately opened up, showing I'm getting good surface tension. Slipped it on the hot stone, and within 5 minutes, it exploded.