Got all of the ride height stuff and corner weights figured out only to find the car still had the nasty vibration. Made for a long race weekend... but still had some fun just being there. Long and frustrating story short, we pulled the opposite side half-shaft to find a toasted ball and marred race in the outer CV.
I don't understand for the life of me how the unloaded side of the car can produce such a vibration unless it settled in the bad spot when it was lengthened. At any rate, we may have finally found the problem, so that's a plus.

It's raining on what might have been our last day to test the car at speed, so I guess we'll try it at Topeka this weekend. Fingers crossed!