Sourdough sandwich bread

Our starter, Puss, has indeed grown to become Sourpuss. We've enjoyed sourdough waffles, sourdough pancakes, and, finally, a really good sourdough sandwich bread. These loaves are my third try, and the best by far. The recipe is from The Joy of Cooking, with the eggs omitted, and 2 tbsp. peanut oil as the fat. (Besides brushing the loaves with melted butter.) I also knead the dough in my Kitchenaid for at least ten minutes.

I'm still on a quest to improve them, though--I want them more sour, and taller.