If you know you were overpaid and owed the State the money, why would you appeal it? You need to do your very best to report your weekly wages to EDD accurately.
Your UC benefits are going to be audited periodically by the State - as is everyone else's if what the employee reported for wages conflicts with what the employer reported. There is no avoiding that and appealing the current overpayment decision will change nothing. Be careful - if you are routinely under reporting your income, the UC Division is going to be on alert to watch your claims. You don't want them coming after you for fraud.

