Amazon go further than eBay when linking you. You need to reassess how you are making your stealth accounts. You don't have to change your pc a new user account is enough but you would have to go over the browser finger printing step listed in stealth. Other option is to a windows reinstall.
Its probably a bad luck with the address/name/phone... They can't have enough information in such a short period to link you from browser finger printing. It also might be because you listed the same products...
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