American Idol’s performance finale on Sunday night drew 7.4 million total viewers and a 1.3 rating, down 13 and 23 percent week-to-week to mark Season 16’s third-smallest audience and tie its demo low. Opening ABC’s night, AFV (5.3 mil/0.9) slipped 25 percent, while at 10 pm Deception (3.3 mil/0.6) dipped to match its series low. […]