The horrors stories I believe were the initial installs with the 2" drop instead of the 1.2" and also the rear links were adjusted too low causing a very rough and bouncy ride. I had mine installed and set the links to the same as front and it rises just fine. The recommended settings from H&R which I believe is 65mm between posts is a little too low. I originally set mine to the recommended and it sucked. Adjusted it to match fronts ride height and its night and day.

Not sure how much your eibachs would lower as I haven't seen to many examples without air suspension in rear. Eibachs have been known for comfort rides and always liked them. Surprised they never made a set for the air suspensions.