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

I had the exact thing happen to me recently on my 426 Hemi rebuild. I bought a brand new hydraulic comp cam kit. Assembled it and dropped it into my Cuda and fired it up. I had encounter the same problems you had and thought my Carb was acting up too. It wasn't the carb, so I checked the compression and it was showing 80-95 PSI. For a brand new engine this was not right, so I thought my valve adjustment was off and tried to adjust it. As I tried tuning it the response got worst and at the end one of the cylinders stop firing and that is when I knew something bad had happened. I pulled that lifter out and it had ground to the inner core and left a hole in the lifter.
After 5 minutes, My heart started to beat again and I could actually breathe on my own, I started to pull the other lifters out and that is when I knew I was in really big trouble. 13 of the 16 lifters were ground and some had chips on the edges. I must have used every known swear word or phrase in the dictionary and a few that I had made up. After tearing into the engine, I finally got the cam out and could see all the damage it caused to the Cam bearings. I made a call to a good friend who owns one of the most reputable machine shops in town and he mentioned the problems he and his costumers were having with Comp cams. My other friend who also owns a well known machine shop had said the exact same thing about the cams from Comp. Even with the Zinc additive oil and racing oil combined on the break in periods costumers still experienced ground cams. Purchasing hydraulic/solid cams from these certain manufactures is like playing Russian rolette.
After 7 years of labor and of course MONEY... I seriously asked myself if it was worth the extra time and money I would spend pulling this 850lb. Elephant out of my 1971 Cuda again... With a nearly perfect paint job and 2 gallons of clear my thoughts were to leave the engine as is and try to clean what I could and replace the cam bearings and install a new camshaft and live happily ever after... I was still in shock and in denial about this whole thing and could not bring myself to go through this again but after consulting with my machine shop buddies they gave me 2 options to my ordeal, #1- Do what I thought was a good idea and just clean and replace what I needed too then sale the car before I drove it. OR #2-Do the whole 9 yards and really double check everything which of course included buying a very good cam. I really wanted to enjoy this car before I die. (which if all goes well, won't be for another 55 years: 100yrs)
Well, after a long thought process which lasted for a few minutes, I decided to go with option #2. If there is any really good advise that I can share with all of you is this, Once that camshaft starts to grind those lifters and the little tiny, tiny particles mix with the oil that splashes all over the connecting rods and crankshaft below the chances of that contaminated oil flowing through your engine is probably 80-90%.
When I took apart the whole engine and went through the conrod/main bearings it was covered with shaving particulates. This was not the bad part, the one thing that could have really cause a catastrophic failure was the wrist pins that were galled. And there was 3 of them.
So there you have it. I hope this helps you. And if you are wondering about my car, It runs, sounds and drives great! It was all worth it! actually, there is more to this car then just the engine. I did have to change out the 4 speed trans and bell 4-5 times also...That is another story for the next time.

Thanks for your time and good luck,

ty