Allen
Sad that you suffered pain in your rear.
But also somewhat surprised. I did not think the ERA rear to be fragile. Now Hoosier A-6's are good but not exactly drag radials or cheater slicks. The cause may turn out to be bad metallurgy.
I say this because I've seen a friend's FIA with 580HP Windsor make numerous hard passes and not hurt the rear. This on BB's-not great but a lot of contact area.That's about 130 more HP than you hit it with. Did you clutch-drop above 2500 or drive it out?
Please report what the post mortem reveals.