Bread-Bakers v096.n002.20

I don't get it
Everyime i try to bake bread, the crust is fine, the taste is fine , but the 
middle part always is kinda to moist or doughy, I use a kitchen aid for the 
mixing and many different recipe's but always the same . I live at about 3000 
ft of altitude .... Also the crummb is always to fine a texture, always small 
bubbles instead of the big holes and craters that i am trying to get,
Anybody got any Ideas??