In patch 1.03, a cap was added such that any attack done to elite enemies (e.g. lieutenants, mages, saarebas, and rage demons) is capped to 40% of their health.
So now however I spec my dual-wielding rogue, I never kill them in a single hit: my max tops out at 80% (40% per hand). The lacerate talent gets around this, but it only procs 10% of the time.
Since the rogue thrives on single target assassination and taking priority targets out of the fight immediately, I was hoping there was a way to remove this cap.