Please go play it and post for 10 man too. You will see similar results in 10 man too. I did a looooooot of testing and played around a lot.
AA is and will always be mandatory, unless it becomes useless not so because of HPS but more due to HPM considerations. You are mana limited and that means you will heal a lot more with archangel than you will without, because you get more bang for your back. Its effect is greatest when its used to store up healing for burst, but even in a sustained HPS sequence, AA is important. People who think that 5% and 10% drops are ok are deluded.