Exactly what i do! But as the symantec article<http://www.symantec.com/business/support/index?page=content&id=HOWTO54706> say, If the system is rebooted or the Endpoint Protection client services are restarted then new identifiers will be generated and you must re-run the tool before cloning.
So when I recompose my pool, a new ID was generated at the first startup (after cloning) before the sysprep/quickprep process!