I do have the sheet, I'll scan it when I get a chance. It still tramlines pretty badly. Even though I paid for a 4 wheel alignment, from looking at the numbers I don't think they did anything to the rear. Probably drove it off and back onto the machine and remeasured. Maybe the rear was close enough to being in spec.
I got under the car and did some internet research, the subframe issue is apparently an oil filled bushing at the back of the differential that has ruptured and lost it's oil. The official fix is to replace the entire aluminum rear subframe that the bushing is pressed into. This is a $2,000+ job. It appears so far that no one makes a replacement bushing for this vehicle, although the G35/350Z has an almost identical bushing but with a smaller internal diameter that a couple aftermarket companies make. A couple companies list that same bushing as fitting the FX's, but apparently they don't. The existence of that part would change the job from removing every rear suspension piece in addition to the differential and exhaust, to just removing the differential exhaust and driveshafts.