Bread Saga

I continue my saga to make a normal loaf of bread in the bread maker. It took me two returns to get a working Breadman TR875. The first was broken, with the lid cracked and broken, and the second was missing parts, the paddle for mixing the dough. Since I got a working model, I've not been able to make a loaf that looks like a loaf of bread- the top always collapses, and the middle is too airy, and the bread breaks in two. I know I'm getting the mix wrong, or at least not adapting for altitude.