The Cherub is more sensitive to crew weight than many boats but i don't think you are over the ideal by a long way. what do others think? 130kg is often quoted as ideal, I think and it's swings and roundabouts come the windy stuff, so you'd find it starting to come back to you above 10-12kn of wind.
Are you thinking twin wire?
You may have spotted that we are all down your way in three weeks time, so definitely come and chat. Andy and Jill Peters sail a Cherub at QM, current national champions.