I finally found this snippet from Caridad, stumbled across it finally by deciding to dequeue everything:
http://wp-types.com/forums/topic/find-the-wp_enqueue_style-for-cred/
However – going about it the normal way, adding in js into the javascript boxes to add/remove classes doesn't seem to be working. Whether I write it myself or copy the js snippets I find on the forum. Is there a trick to entering in js to the js box on the form settings page?