SP2007 Migration to 2010 dbo.alldocstreams SQL

After migrating a number of DBs from 2007 to 2010, the DBs grew to a ridiculous size.

one DB was 1GB in SP 2007 (SQL 2003) and now in SP2010 (SQL 2008) its 70GB more.

Ran a report on the DB and found the dbo.AllDocStreams has taken up all the space, seen an article stating this is normal, but not to increasing a DB to this amount.

Any ideas to the cause, how to troubleshoot?