Stop excessive System Notes

We're finding that when a contact is updated, a large number of system notes area created for each custom field attached to a contact record, and this is making searching through system notes very cumbersome.

Specifically, I have created hundreds of custom fields that allow us to track actions that a contact has taken on our website, and even if a contacts Job Title is updated, using the native NetSuite field, every custom field applied to contacts is updated to it's original value, and a system note is created

For example:
Our website offers a large number of white papers for our customers to download. We track each of these downloads by updating a custom checkbox field. Let's say that we have 100 of these custom checkboxes. If I edit a contact and change the Job Title, then there are 101 System Notes created: 1 for teh changed Job Title, and 100 for each checkbox. In the case of these checkboxes, they are 'updated' (or re-set) from 'F' to 'F'.