Rear subframe

If you loosen the rear subframe is there room to adjust or re-center the rear suspension or is it a fixed position?

I put on 10mm spacers on each side of the rear axle and now I am noticing that the passenger side rim is more flush with the fender than the driver’s side. I brought it to the dealership and had an alignment done but it doesn’t seem to have corrected things. It’s like the axle isn’t centered.