I wanted to update everyone on the spindle/bearing issue.
A month ago I had asked Superformance in Irvine to forward this thread to Hi Tech, and to get their feedback on the bearing wear issues. I didn't hear back from them, so a few days ago I asked Deborah Stander to again follow-up with Hi Tech. She received the following e-mail reply today from Justin at Hi Tech.
"I have had a look into the spindle and bearing issue, and here is my take on it…
The spindle and bearing setup is an exact copy of what the original cars ran. I personally feel that the setup works fine, PROVIDED you check the preload on the bearings regularly. If the preload is not sufficient, the spindle could spin in the bearing, causing what you see in the pictures.
What we can look at on future cars is putting a spacer between the inner and outer bearing so that you can really tighten the nut without worrying about preloading the bearings excessively. I will need to do an investigation and will get back to you."
As I mentioned above, Holman Moody did create and install spacers on my front spindles, so I'm glad they seemed to make the right decision. I don't know if or when spacers will be available from Superformance. If you're interested in them in the short term, you may want to contact Lee Holman.