Please send me an email with regards to the issues with the builtwith data, I'd be happy to identify the false positives to ensure they are not in your reports. Thanks!
Looking at just the script tag (eg: mbox.js/cdn.optimizely) and taking it as signal doesn't provide accurate results especially in case of providers who provide the option of self-hosting.
I will send you an email shortly with the methods that i used and let me know what you think.
