@Ragnarok.Himsaa This can be done with an INSANELY well-geared Samurai, a Red Mage/Scholar for a healer (As well as Haste II, Phalanx, dispel, erase, enfeebles, nuking the tree, etc.) and a Bard/White Mage doing March Minuet Minuet, or March Minuet Minuet Madrigal (for Accuracy) and doing erases, sleeping things, and dispeling the T4. Wopket goes down relatively quick as well, it's getting to him that's the pain. Doing 4-way light skillchain kills nearly every NM other than T1 in minutes, and of course you need some kind of luck with adds and NM pulls. A Geomancer might be a good replacement for Bard, with haste and fury for attacks and entrust one of them and use frailty on yourself for Wopket.
@himsaa the delve mobs' HP are now (not sure when they did it) proportioned to the # of ppl in your party. Taking only 3 people means the mobs had 1/6th their normal HP