After 4-wheel alignment, handling is very twitchy.

[san rensho]

It could just be your tires. New tires are very squirmy because the tread blocks are very tall and the rubber is soft from the factory. After a few heat cycles, the tires firm up and handle better. when I got 4 new tires, my first ride out I thought I was on ice.

And by the way, wear on the inside rear tires is likely not from the negative camber in the rear. Its usually from too much toe.