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I think the reason for the hit is the number of pages and site age - as 3 old sites with the same structure did not get hit.
As for duplicate content - the script is posting meta title, meta description, H1 with model name variable, and other content is suggested models - I do not think the pages are duplicates from other sites.
So all your sites are running fine, but I am asking again - are they running fine on aggregators on fresh sites?
Also, I do not think you are doing manual unique content for your 50k model pages.
Also, it is not a sandbox - I had tons of sandboxes when you are not ranking from the start of the site for the year(s). If you are ranking and have a huge drop - it is a hit.
And I am not using used domains - tested it a long time ago - it is a miss from the beginning.
Also thin content - other sites are ranking very well without a hit with zero content - model name, several thumbnails.
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