Are we talking about the same Intel Burn Test? I see no graph or anything. Or do you mean the results log?
Anyway, I'm not really convinced this is a problem with offset voltage or c-states. I just rebooted at stock setings, there's frantic activity and 3.8Ghz speeds but the vcore is between 0.7-0.9 or so. I'm pretty sure any sort of serious load at 3.8Ghz with 0.7 vcore will cause a crash immediately. If it is a problem, I don't understand why I'm not experiencing it. I overclocked up to 4.6GHz using offset and it works just fine.
Are we talking about the same Intel Burn Test? I think you mean Intel XTU utility because IBT was never available from the Intel site.