I tanked it in mostly 63's and a few 61's on 8 man HM. Also, all augments were still 22's. The yellow phase is pretty easy if you stay on top of interrupts. Have your tank interrupting one and have the healers or dps (we have a ranged dps in the middle to clear adds and a tank on the button for yellow) interrupt the 2nd regulator. Damage will be kept at a minimum.
Hope this helps!