Is LP distortion the record or the cartridge?

@lewm , for certain. He can add some mass. Soundsmith makes a nice set of graduated cartridge screws. It certainly is not the Atma-Sphere overloading. I have a sneaking suspicion it is just worn records. 
The Lyra Atlas is a fine cartridge certainly in the upper echelon of cartridges. Not the best value but hey, if you have the money why not?
@mglik , what are you using for loudspeakers?

I think the culprit is worn vinyl.
I do have a lot of used records. Guess I will flag the worst ones.
I think the greatly increased performance of my new Atma MP-1 just picks up and amplifies the wear issues.
The good news is that the 180 gram remasters do seem to all lack this overt distortion. I know they are not as good as good as good first pressings or Better Records but they are very enjoyable.

@mglik , What speakers are you using?
There are certainly times when the reissues are better than the original particularly when it comes to older popular music. The quality of the pressings was not near that of classical music and in the late 50's and 60's recording engineers doing popular music were not as experienced. As an example the early masters of Zappa's first 4 or five discs were terrible. The remasters are fabulous. The reissue of Weather Report's Sweetnighter is significantly superior to the original. I would rather have a good clean pressing at 9/10ths sound than a scratchy one at 10/10ths.

Dear @mglik  : "  I think the culprit is worn vinyl.
I do have a lot of used records. Guess I will flag the worst ones.
I think the greatly increased performance of my new Atma MP-1 just picks up and amplifies the wear issues. "

That could be true if your before phono stage was a " terrible " poor design to cover those kind of distortions.
Do you own or can put your hands in other cartridge just to make tests?
I asked before which phono stage was using and I would like to ask again. Could you share/disclose that phono stage?

Thank's in advance,
R.

I have Tetra 606 speakers. AMT with ATC dome midrange in an open baffle. and a 10” woofer in ported box. Very accurate. I don’t have another cartridge but am waiting for my Lyra Atlas SL.
My former phono stage was the John Curl one in my Audible Illusions preamp. My guess is that much of my current detail with the MP-1 is, in fact, picking up much more of what is actually in the groves.