There's no way in hell I'd ever go that low lol, was just stating how much room I have now. Will probably go 1" and see where the splitter sits. There's a lot of dialing in to do but I won't go low enough I'll have to worry about changing the steering rack or axle slapping frame issues.
I've generally been told to watch the axles - avoid excessive angles. And per comments earlier in the thread, really low cars are a pain to get on the trailer, especially with $1000 carbon splitters poking out there looking for something to catch on --- not to mention that occasional (inevitable) trip into the gravel trap.
If a race shop is doing your corner balancing, insist they put your equal weight in the drivers seat - or sit in there yourself, if they will let you. And have the battery & average fuel load on-board.
Also remember you can't easily change between older full race (bias ply) tires and radials without camber changes. So best to pick the tire you intend to run, and research their camber & toe settings before going to the alignment shop. And have the tires aired up to their expected hot running pressures.
Being able to do corner balance and alignment at home is nice, but pretty difficult unless you have access to a drive-on rack. Scales, turn plates, and a set of strings are affordable (even better if costs are shared with others), but impracticable unless you can get under the car to make the necessary adjustments.
Check out Road America or Blackhawk events sponsored by the Milwaukee region car clubs (all on MotorsportReg.org). Audi, BMW, and Porsche clubs all have RA dates, and BMW has two event days at Blackhawk. Good people and all do great Novice training (you mentioned your wife is new to track events). But don't wait too long, the Novice groups tend to fill up first and earlier over the past 2 years. PM me if you need more specifics.