This really gets to me at times. I'm running level 25 Epic Elites today, in Catacombs, and I'm pulling Smoldering Embers and Mystical Formulae. I've noticed this before, but today it really got to me. I can understand getting these lower-level collectibles in some quests, sometimes, but getting them consistently in mid- to high-Epic Elite just doesn't seem right to me. Maybe RNGesus just hates me. I don't know.