Cam wiped out, what the hell did I do wrong?!?!?

64,
It is entirely possible you have a block with poorly machined lifter bores. This would cause cam failure even if everything was perfect, and is never checked. I don't check for it either, so I wouldn't beat yourself up too much over it if that's the case. This is a real problem with Hughes' cams over the years because they are so aggressive on the rate of lift. It's also why I shy away from max rate of lift cams for street builds. I think in terms of the break in process you did all you could. I don't like the beehives for break in because there's no way to calm them down. If I had to guess, I'd say it was the combination of the spring pressures and possible lifter bore angle issues that did this. Not you or your work. But that's just a guess. The ultimate "fix" would be to have the lifter bores checked and bushed to correct them. Or change cam profiles to something slower and/or get a set of very light springs to break in the new cam. Sorry this happened.