Shredding belts.

I used to have to run my power steering belt TIGHT! Like the belt was so tight the back of the belt would cup as it went around the pulley. If not it would pitch it at 6300-6400 rpm. Same for the water pump belt. Finally went to under drive pulley and it stopped throwing them. Never had any issues because they were really tight and back then I drove it on the street. Did you jack up the front and start the car to see if it self steers?