I did a run with about a dozen people a month or so back. Some things to remember:
1) Make sure everyone who wants mitts has an offering. We had some tool have to go get his offering halfway through, thus costing us and extra 45min wait.
2) {Bard}+{light carol}, {yes please}.
3) You do NOT need a prelate key to get through the doors to the NM. You can aggro a magic pot from the other side and when it comes through it will open the door for you. So don't waste hours killing tonberry stalkers trying to get that useless key. This works as of about a month ago, but it could have been changed since then.
4) Searing light has a very wide range, so if your a lower lvl mage and you pop the nm, it can very easily 1-shot you.
Best of luck on this guy, I love my carby mitts.