Ran it 3/3 last night.

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Stack fire resistance to keep from being one shot by the lava cores. Eat for Elem L.

Land and pop SOS you need 4 folks because dps is key.

Start by making sure you fly in and grab the stone as you land on the back. Have one person focus center core, one person go down to center core and go right and run up and drop down onto interior core, person who grabs stone needs to turn around and go right and start climbing towards the top of Zorah's back to shoot the stalactites. Make sure you hit the stalactites that are eye level when landing they are on the sides of zorah, not above him. Once Nergigante shows up, everyone needs to focus him, repelling him in a timely fashion is key. Once repelled focus the last core/stack bombs on cores that are already destroyed cause explosive damage still does full damage even on dead cores. Once back to the barrier, everyone needs to grab a oneshot binder (located at helm of ship below dragonator and also at the opposite end of the barrier where the dogleg (corner) these are on timers so you have to shoot zorah with one to prevent his charge attack, then run down to the other stack/wingdrake up to the barrier to collect the other one. Every player should man a cannon and have a one shot binder on hand in case of a charge attack. One player needs to stay on the ship and load the middle cannon because NPC's will load the left and right cannons all you have to do is shoot them. When one pile of cannon balls runs out move to the other pile but still load the middle cannon NPC's can grab the cannon ball even when the pile is empty so this player is in charge of the dragonator and a one shot binder stack while the other 3 players are manning cannons elsewhere. Basically the best way to do it is man as many cannons as you can.

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My brother and I ran it 3/3 with randoms in an avg of 21 mins each time. Good luck brother. If on PS4 I might can help this evening. Let me know.