Guideplate wear. Replace?
Those look like the GMPP plates? Rumor has it that some of them are not hardened. A small amount of rubbing is acceptable, but gouging into the guideplate is not. I'd try the hardened Trick Flow plates 30400623-8. Also, when you install them make sure you center them over the rocker studs before tightening them down. This will help keep the geometry in alignment.
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