One more thing to check, particularly if "mistracking" happens only on a few recordings, is to see if that problem might just be the recording microphone overloading. I noticed such a problem with one record where I assumed the problem was either mistracking or groove damage until I heard the digital release and noticed the same problem.
I don't know about the Atlas specifically (I own a Titan i), but, all of the Lyra cartridges I have owned tracked real records quite well (not that good on some of test records) and I would not expect to hear much mistracking.
I don't know about the Atlas specifically (I own a Titan i), but, all of the Lyra cartridges I have owned tracked real records quite well (not that good on some of test records) and I would not expect to hear much mistracking.