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Yes, I do think you are being overcautious to the point of potentially harming your trees. I believe the trees you mentioned will not be harmed by freezing temps/frozen soil, at least not at the temps you mention. Again, my trees, including Acer palmatums, regularly freeze solid and stay that way for weeks and even months. It doesn't bother the trees one bit. Moving your trees in/out of a heated/warmer environment is more likely to injure your trees then the constant cold.
Dave
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