OP, what springs do you have installed in the car?
I believe you were describing that the rear spring was rubbing on the body of the car at the rear of the spring in the coil spring tunnel? Please see attached photos. Not sure if I am using the correct terminology. When you lower the car I believe the rear axle gets moved toward the rear of the car slightly. I lowered my car 1.2" to 1.5" and my passenger side coil spring rubs also when I leave or enter my sloped driveway with curb because I have adjusted my pinion angle with adjustable lower control arm to get a lower pinion angle(Trying for between 1 and 2 degrees). I can eliminate the rubbing by increasing the pinion angle but I want to have my driveline closer to being in phase to eliminate vibration.
I also have relocation brackets, non-adjustable LCA's, and adjustable UCA from BMR. To actually solve your problem (Mine also) you will want to get adjustable LCA's. Or increase your pinion angle.
I can't believe I didn't notice this previously, when we discussed.
You are definitely making some valid points, BUT....what I also noticed immediately, after seeing your pics again - is the springs you have seem to be substantially larger (OD) compared to the OEM springs, or some other aftermarket pieces.
Due to your situation being very, very uncommon for me and my dealings, I decided to look into that further. This is what I found thanks to Google.
BMR vs OEM:
Vogtland vs OEM:
I don't want to pass the blame off on another company, but I think it is a compounding situation. With an OEM spring, BMR, or any other spring that closely resembles the OEM outer diameter, I imagine that this issue would not be present. I could be wrong, but as I stated earlier....this is very uncommon. I can also state that I rarely ever speak with customers who have these springs (Vogtland)