My May 3 column explained how to give negative feedback and correct otherwise diligent staffers in a humane, respectful way. Some more tips. * Remember your purpose. Your negative feedback should be designed to provide constructive feedback that will help your staffers increase their contributions to your office — not to embarrass or demean or “gotcha” them. * Watch your voice. When you criticize or make suggestions to subordinates, your tone should be as calm, tactful and respectful as when you speak to your superiors. * Don’t pry into personal matters. Don’t relate your staffer’s mistakes to his personal problems…