Suspension Anyone?

I have a 93 Acura Legend LS 4 door with 121k miles. I put 16" wheels on 6 years ago and recently I have wheel well rubbing on rear tires when cornering or going over bumps. i had the rear springs replaced and a metal cover over the right rear brakes. It has improved but is still rubbing. Acura dealerand private garage do not know. What has changed to cause this

Are you sure it’s the tires rubbing and not simply a bent dust shield? Can you see the rubbed spots on the tires?