One side lower ... thoughts??

When I installed the rear set of Eibach springs a little over a week ago, I noticed that the passenger side sits about .25-.35" lower than the drivers. I am pretty sure that the driver side is the correct height just based on comparison to the front (it's visually proportional). I measured from the ground up to the bottom rear corner of the rear doors and found that the driver's side was 27" and the passenger side was about 26.6". From the rear of the car, it's visually noticeable too. I double checked the part numbers on the coils and they match. With the stock coils the ride height was even. Without removing the coils to comparison measure, my thoughts are a few ...

1. A faulty coil?
2. Did the coil seat properly (is orientation of the coil seats imparitive)?
3. Did something in the suspension geometry change?

Any other thoughts on as to why this may be?

I'm going to remove both rear coil assemblies over the Thanksgiving break and try to determine the cause. Might have to put the OEM springs back in. :disappoin

You have the same thoughts I would offer up... Maybe give a few weeks and some really bumpy roads to settle?