Have you looked at the British
Parliamentary Papers for the nineteenth
century?  The "Blue Books" cover all sorts
of topics/testimony upon which Parliament
held hearings, including several volumes
devoted to slavery.  I don't remember a
citation for your particular vessel, but the
mechanics of the slave trade and its
routes was the subject of major
investigation.
 
[The papers are great sources as well for
researching sanitary sewerage, living
conditions of the laboring poor, and public
health.]