If you can, try a slow rising by replacing the last 2 hours of resting (step #8) by 10 hours at 50°F (10°C).
If you'd like more information on making your own bread, you can consult this special page
Yeast in leaven-raised bread?
Many of you are puzzled by the presence of yeast in a leaven-raised bread. Here is a little clarification of the matter:
The yeast is there to make things easier; for a beginner leaven-raised bread is not easy to get right, especially first time. This is why these few added grams of yeast help. The dough rises more easily, even if your leaven is not at its best, and it makes a lighter crust.
There's nothing shocking in this. You should be aware that even some commercially produced breads advertised as “leavened”, also contain a little (more) yeast, for similar reasons, and it's perfectly legal.
In any case, there's no reason to be worried about yeast; it's not a chemical product. It too is a living organism, and it's not added to work against the leaven, rather something you can use alongside if you wish
. Being able to proclaim proudly, “I don't use any yeast!” is, in my humble opinion, rather overrated.
That said, adding a little yeast does have one slight drawback, in that it dulls the flavour of the bread somewhat. If you want to make leavened bread for its characteristic flavour, you'll lose a little, even with a small quantity of yeast.
In conclusion, I advise the following approach: if you are just starting out, add a little yeast. Then, once you have mastered the basics and can produce good bread, leave it out. You can then compare both methods and choose.