Hey, to jump on Muskrat's boat, if you ask me, those followers are hideously wrong. Apparently sand cast with no machining to fit the barrels. Then, the surfaces that ride on the cam don't seen to have been hardened with respect the rest of the part. I'm pretty sure the followers would be hardened and that it is unlikely that that hardening would equal that of the forged camshaft (metalurgists here will know for sure).
So, even though the followers seem a likely culprit (and you probably don't need me to tell you this) be sure you're sure before giving them complete blame.
Richard L.