I have made Shiao-ping's wholemeal a l'Ancienne (http://www.sourdough.com/recipes/pain-l%E2%80%99ancienne-two-modified-ve...) three times now, with success. We love the flavor of this simple bread! However, I could use some trained eyes to troubleshoot, as I am still a novice baker. I would like my bread to be taller and not so saucer-shaped. I didn't vary from the formula (except for amounts being a little inexact by using American volume measurements). Did I overproof? I don't really know how to tell when it is proofed the right amount, so just went by the time specified in the formula. A bad slasher? Is my proofing container just too large for such a high hydration dough? I have no bannetons but proofed the dough in a large colander lined with a floured towel (which did give an interesting design!). Please nitpick; I want to be an expert someday! 
Adding crumb shots as it as cooled enough to cut!
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Looks to me like you have most everything right. For a taller loaf and more oven spring try a lower hydration and/or less proofing time. Make sure your oven is very hot (preheat for one hour at topmost setting) along with whatever you place the dough on in the oven.
I did preheat oven and stone at 480 F for a good while before loading. =)
Well, not really a secret...
I went from loaves similar to yours to loaves that more closely resemble round baloons!
Here's what I do: It looks like you proof yours "seam-side up" in some sort of container, right? Then you flip over onto a peel? Then, I'm guessing, as you do your slashing etc the dough starts to spread out? Try this instead. In whatever container you are using (smaller might be better), line the bottom with oven paper or parchment. It may no go in neatly depending on the shape, but it doesn't matter and if the paper rises high over the sides of the container, simply fold it down. Place your nice, tightly shaped loaf "seam-side down" into the container for the final proof. You don't even have to flour the oven paper! When ready to bake, take a pair of scissors and cut of the excess paper you folded down around the outside. Then, do your slashes while it is still in the container. Then, grabbing the edges of the baking paper, lift the loaf and paper out of the container onto the peel, as if the loaf is laying in a shallow bag or a hammock!. You will find that the over paper is STUCK to the dough BUT DON'T PEEL IT BACK! In essence, it is acting like a soft loaf pan, giving your dough extra support. From the peel, slide the whole thing into your hot over, paper and all! You will find practically no change in shape from your container all the way to the baking stone. As the bread springs and crust hardens the paper will peel away. I usually go in and pull the paper out after about 25 minutes.
Here's a loaf I baked using this method. Not a great picture, but you can see the roundness I think.
Good luck!
You could try baking under a bonnet. This was an old technique used by British bakers for competitions. Essentially you bake the bread under another cover, I use an a large IKEA stainles steel salad bowl. The bonnet keeps the atmosphere very steamy allowing the crust to continue expanding before it finally sets; Elizabeth David refers to this technique in her book English Bread and Yeast Cookery.
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arturoenk, I have been wanting to try the bonnet technique but do not currently have any appropriate vessels with which to try it. A nice big metal bowl or perhaps a cast iron dutch oven are among the many things that have been added to my wish list since I started baking bread. I do steam my oven in the beginning, but I feel like I lose a lot of heat in the time it takes to get the dough loaded and water poured into the pan below.
atephronesis, I am DEFINITELY going to try your technique next time. Your balloon loaf looks very happy to have achieved such heights! You are correct in that I proof seam side up in a floured cloth-lined colander, and then flip onto a sheet of parchment, score and hammock into the oven. But I thought there was a reason for allowing some air flow directly to the bread? Or was it just so it didn't stick to the container when inverting? Either way, I'll give it a go. I would've even tried baking it in a tin by now except my only loaf pan is glass and I worry about causing some horrible shatter adding glass to my steam and stone combo.
Let me know how it goes! As with everything, it takes practice, but one you get it down, it's a great feeling.