Have you measure the cam journals prior to assembly? If so, what did you use. The alignment issues people speak of, in my experience, is a distorted bearing due to a tight journal. Lastly, the bores I find to be undersized are so by a half a thou to 1.5 thou (.0005-.0015).
Disclaimer : If you aren't measuring with a .0001 resolution dial bore gauge set up with an anvil mic we will probably have different experiences.