Hi Jon,
I can see how milk and milkshakes would cause a phlegm problems. I have not had radiation or chemo but I have had 4 partial glossectomies and struggled with eating. I found eggs to be good. They go down fairly easily. Of course, I had a lot of Ensure but they may cause the same problem as milk does for you. I also enjoyed vegetable soup and I would break up crackers and let them get soft in it. Hope this helps