Subframe alignment

[Che70velle]

Are you sure your camber numbers are equal on your front end, from left to right?
If you have a level shop floor, place the car on jack stands, remove the wheels, and plumb bob the rear end, using a quality plumb bob. Drop the plumb bob, as far as possible outward on the rear end. Right against the axle flange, if you can. Once your marks are on the floor, use a straight edge, and draw a line across the marks. Use this line for your reference.
On your front sub, do the same thing, but use your crossmember. Again drop your plumb bob as far outside as possible. Locate your marks on the floor, draw a line across, and take measurements front to back, on each side. This is old school, for sure, but it works. A clean, level shop floor is key. Takes about 30 minutes.
Check your camber first, then plumb bob the car if needed.