It should be expected to use the ring file to make the perfect fit with an application like your doing.
It could be possible they shipped you a set of rings assuming youd be using it for a particular setup ie, stock bore for street use.
I have never heard of them shipping out the wrong rings or pair of rings but there was one incident of a mix up I read about on Freshalloy.
your pistons are for stock bore I take it? Was your motor honed?
Why don't you give CP a call and talk to them in person maybe that would be more helpful that coming on here immediately.
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