Sorry about the deflating loaf, Frank! To determine how to scale your loaf down to the 13 x 4 x 4 pan we need to get the volumes of both pans. The 13 x 4 x 4 is 208 inches cubed and you pan is about 280 inches cubed. This means the 13 x 4 x 4 pan is about 25% smaller than your pan. To adjust for this, you can increase the weights of each ingredient called for in your recipe by 25% and increasing the baking time in the recipe by 10-15%. The baking temperature can stay the same. Happy baking!

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