You are using calibre's content server. That I can do something about.
What I can do is provide a 'tweak' where you list fields not to be included in content server output. I will do the work in the calibre custom field beta, which will become the production release in a week or so. The tweak name will be something like 'content_server_ignore_fields'. I will almost certainly include the ability to ignore standard fields, such as comments and rating.