The guys hit the big ones...
zinc (ZDDP) look for a CI-4 or CH-4 rating.. I recently swithed to full
synthetic rotella t 5w-40 for this reason. Proper break in and break in lube (The motor MUST fire and stay running immediately) both on the cam and lifters on install and also on the additive (like from crane etc).. of course varying the rpm all above 2000 during the initial break in period. Use of break in springs (often just the outer)... depending on the pressures you are running, may not be required. Check with the cam manufacturer. Other sources of problems are improved
oil control (yep, double edge sword), improper restrictors, etc. EDM lifters are nice but often (most of the time) require a restrictor change.
My concern, if it you did all that right, and you wiped a new cam during break in alone, you have other issues. Could be that the lifters are not in proper relationship to the cam or a number of oiling system related issues, spring pressures and/or valve train geometry. Lack of
zinc is an issue but your problems are coming on way to quick for me to beleive that is the sole problem.
Why is your shop not breaking in the motor for you? I would not do business with a shop that does not. Then, they can't say I broke it in wrong! Good luck to you.