Macca,
Where did we say that corrector weights aren't shown on the cert???
It is perfectly reasonable to state that a boat is over minimum weight and still list the corrector weights required to be in class.
It should then be obvious that if a boat has correctors listed on its certificate that it should always race with those weights in place unless the boat is reweighed and the certificate amended as necessary.
I can recall several of my Tornados having the corrector weight amended in this way over time.