Do T3s if you are building a Mythic, as this gives the most Ichor.
Some waves can still be dangerous if you round up too many, especially nukers like Soulflayers. Make a MDT set and pick off a few before rounding them all up. Twilight set for auto Reraise is nice if you have it.
If you get the Cerberus NM, switch to a pet like the slug and bring a dagger so you can do Aeolian Edge or Cyclone. You want to do a lot of magic damage to speed this up, otherwise you will be fighting it all day and get stuck hitting for zero.
Also be weary of the Vamypr. If you don't kill it fast enough it will turn in to a bunch of hounds who ran around like crazy. It can also Charm you, so be careful of that. Save Unleash for the bosses and get them down quickly.
And before I forget, bring a HQ Cricket pet and use Bestial Loyalty. Can use Familiar too. I don't bother with Run Wild.