They changed the mechanic so that if you push him into his 2nd insanity before his 1st goes off you don't get shadows (perhaps it was always like that)

The only consequence though is that you don't get the normal loot cursor, you have to sort of hunt and peck on the boss to get the loot.

I'll re-run it Friday and post the meters. Maybe I'll fraps it if I can get it setup.