Out of interest, what were you using to do the test? (e.g. SBST or a custom script or some such?)
Can't remember putting BS submission features into the Spambot Search Tool (though if you were testing using the hosted versions at temerc.com, fspamlist.com or avant.it-mate.co.uk, you MUST ensure you do not enter your IP with known spammer emails/usernames, as those will be auto-submitted to fspamlist.com as spammers IP's)