Want to defang and delete Spam

I have now spent quite a bit of time trying to figure this problem out
with no success as of yet... but I'm close. Here is what I am trying
to do.

$sa_tag_level_deflt = -100
$sa_tag2_level_deflt = 5.0
$sa_kill_level_deflt = 5.0
$sa_dsn_cutoff_level = 10.0

I would like amavis to add headers to all email. Any email that scores
between 5 and 10 I would like to defang and send to the end user. For
email that scores greater than 10, I would like to send it to the
quarantine to ensure that there are not false positives deleted.
However, I don't want these emails to be sent to the user. So far
everything is working correctly except for the fact that the email
which scores greater than 10 is still sent to the user (in addition to
being sent to the quarantine folder). Is there any way that I can have
it sent to the quarantine folder but not the user?
Any help would be appreciated.

Mitch