Sounds like you are putting way too much torque on them, if you continue eventually your washers are going to mush out sideways until they are jammed tight in the bore.
If they are not leaking then leave them be, if they are leaking you may need to disassemble and check for any foreign material or burrs on the sealing surfaces.
Copper expands more than steel when it warms up and contracts accordingly which makes it an ideal material when properly torqued for your application.
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Today's Featured Article - Talk of the Town: Removin Broken Bolts - by Staff. Another great discussion from the Tool Talk Discussion Forum. The discussion started out with the following post: " How would I remove a bolt thats broken off in a piece of metal and I want to save the treads in the metal and then put in a new bolt. "
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