The rear spring hangers you are using need to be swapped back to the original hangers. While you are doing that, wire brush, lubricate and loosen the u-bolts that hold the rearend to the leaf springs enough so that once your hangers are back in you can nudge the rearend towards the driver's side of the car.
The purpose of this is to shift any slack in the fitment of the springs and the rearend as far away from the passenger side of the car as it allows. Then retorque your u-bolts and re-check them a few times to ensure that they are maintaining the torque. If there was any play or movement there, it will be towards the direction you need the rear end to be.
I had the same issue on my E-Body due to running 325/50-15's on 10 inch rims. I also carefully ground about half of the fender lip off at the top of the wheel well lip using a wet cloth to avoid building up too much heat that might harm the paint. I blended the relieved area in to make the area I removed less noticable.
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