looks like you already have a good idea on what to do.
You’ll just have to get under it and try those things. Nothing is easy when it comes the this suspension.
I liked using DIS to adjust/calibrate the height. It has a complete diagnostic routine for the suspension in addition to calibration.
If one corner is always off, you can just adjust your measurements during calibration to compensate.

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2005 4.8is Le Mans Blue
2011 35D Space Gray