I read a lot of repair manuals and tolerances for milling a head is
0.08. Sounds to me like they did mill too much. When you do get the
head back check it for wrapage. Do you have a repair manual on this
vehcile? I would check the specs on to see the maxium of how much the
head should be milled. Also you may be able to call a dealership or
check the internet for this info. Somewhere it sounds like water is
getting mixed in with the oil. The intake manifold could have a crack
in it. It might need to be crack detected also and checked for
wrapage. I don't know about the shims.