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Although embarrassing to air my mistake, I thought I would post this in hopes I might save someone else from the same problem: If you have adjustable coilover shocks, do not attempt to change your car's ride height unless you are doing it while corner balancing with scales. I rationalized that if I set the ride height using the factory measuring method (documented in multiple places on this site) I would get "close enough" to a balanced car for a 996 that isn't tracked. Wrong. I worked on a level floor, with a full tank of gas (per spec), new tires with factory-recommended tire pressures, using the factory-recommended ride height measurement points, drove the car a few yards after each change to settle the suspension, and after a lot of hard work I was dead on with each of the four measurements. A local indie shop, not really performance oriented, vetted my approach and said it should be fine, it's what they would do. Even after a perfect-to-the-spec alignment this morning the car pulls to the right, enough at 40 mph with hands off the wheel to change lanes in less than 50 yards. My effort was wasted and I'm out the cost of that alignment. The car goes in for a pro corner balance to correct the issue and I'll end up paying for another alignment. Lesson learned. In truth, the effort wasn't entirely wasted because I learned about the stiffness of the chassis, how even a minute change of 1mm in shock adjustment can affect all four wheels, and how each of the wheels is affected. Dialing in the ride height was a PITA but a learning experience that I believe transfers to doing a corner balance. If you install height-adjustable shocks, you must corner balance for optimal handling even if your car is a daily driver and not tracked. Bless you suspension techs who do corner balancing for a living!