How can I reduce the yeasty taste of my homemade bread?

Baking is chemistry. It's not as easy as simply, "Use less yeast." However, if you find the yeast flavor to be overpowering, you might experiment a little with the activation time, (usually about 5 minutes in 80 degree water), or by increasing the sugar/salt to taste. There are also beer breads which are pretty tasty and quick breads which don't use yeast.