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I just came here to say that I also recently installed solid aluminum rear subframe bushings. I went with the 2 piece revshift bushings for the easy(er) install. My car is on completely stock suspension (msport 135i), I've been pretty happy with how the stock suspension rides and handles, I just didn't like how squirmy the rear gets under power or transitioning into hard harnering.
Not only did the aluminum bushings fix the squirmy rear end for me, but there was no change in ride quality or NVH. I'm not a "hardcore racer" type or someone who feels the need to justify my purchases to myself. I don't listen to loud music. I've purchased coilovers before and then swapped back to stock suspension after a few weeks because they were too harsh. I've done bushing in a handful of different BMWs in the past and always gone with oem rubber or "M" spec. I had read enough good things about the aluminum subframe bushings that I decided to try them, and I really don't think there is a downside to them. I think it's possible that there might be something else wrong with OPs car.
To be fair, I did change from summer to winter tires at the same time (exact same sizes on another set of stock wheels), and did a few other maintenance items so my car was down for about a month, so it wasn't exactly a back to back comparison, but I'm totally happy with how it rides and the NVH. I just rode in my father's E46 M the other day and was blown away by how much more road noise he has, on totally stock suspension and all season tires.
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