At my new to me home, I ran my new CC ZT2 into a hidden cut off steel pipe hiding in some tall grass and did the same 45 degree bended blade thing. What a racket it made. New blades, checked the spindles for trueness and no play, and they were not bent, and rotated freely without noise or tight spots. Spindle mounts all good, the blades were in a single plane with each other, but one of them, the one closest to the exit chute, was still hit something.
I found that the exit chute steel had been slightly curled over by the original bent blade before I could get the mower stopped. I used a hammer to pound the curled bit back where it belonged. Have a close look, rotate the blades slowly by hand, hopefully it is something similar and not a bent spindle or misshapen spindle mounting flange.