How to shrink SEPM database on later versions of SEPM

I have a relatively small environment (616 endpoints) that is being mnanaged by our installation of the SEP Manager but the database is 9.5Gb in size, which I think seems on the large side.  I know there is no tool to shrink the database in this version (14.2) and I have the maintenance tasks configured to run as follows:

1. Truncate database trans logs (every 4 hours)

2. Rebuild indexes (weekly @ 0200hrs on Mondays)

Am I correct in thinking this database is on the large side, and if so can take further steps to reduce its size and clean it up?

Thanks

Chris