Should I retain grievance defense counsel for representation before the Connecticut Statewide Grievance Committee?

Yes.

If you have been summoned to appear at a hearing before the Connecticut Statewide Grievance Committee (or a Reviewing Committee of the Statewide Grievance Committee) that means either the Local Panel or a Reviewing Committee of the Statewide Grievance Committee has already found probable cause to believe that you violated of the Connecticut Rules of Professional Conduct or that you violated some provision of Chapter Two of the Connecticut Practice Book. You now need someone to defend your Connecticut law license and your professional reputation as a lawyer.