Done
Magmaw 10hc, as destro+soul link. Lots of ember tap healing to survive the heavy dmg there. The constructs are not a issue, just burst dps (havoc) then when they spawn.
P2 is like P1 with more dmg from Nefarius.
When your pet gets Mangle, remove Soul Link to let him die, then instant summon him (he'll swawn right onto Magmaw) and put Soul Link back on.
8min35 (enrage at 10min) kill with 525ilvl.
And
Omnotron 10hc too. Very easy as long as you have enough dps to keep Soul Leech on. 3min59 kill.