Hi Adam,
Well, I think there *are* some bootlegs of the 1989 Austin performance, but the one you keep turning up is *probably* the Houston, TX. concert, from October 8th of that year (which is often mislabeled as Austin).
The show was broadcast over Westwood One, and is available as an excellent quality bootleg.
This is also the same show where the "Whole Lotta Trouble" video was filmed.
Johnny Stew