Chris,
Just a couple of questions, were the bolts:
1) new or old
2) factory or aftermarket (grade?)
3) torqued
4) thread-locked
5) were you using old style modular or H.D. style modular (turbo pt)

I'm not questioning what you did, just trying to find-out why it happened. I went thru 2 NEW traditional clutches in one weekend at Sebring before I found out the someone helping me get the car ready, zip-tied some wires the adjustable part of the clutch cable. I've since gone the modular (turbo pt) route with a new cable & new turbo bolts. Zero problems after 6-7 track hours at Sebring/Daytona. Please let us know what you find that may have caused the issue.