Full credit goes to ‪@cantthinkofbettername5065‬ for this discovery and talking about the details of the maths involved here. Please go watch his videos and subscribe to him.
So apprently there has been a discovery about Huang Long innate. The damage multiplier is 1+0.01x where it depends on the previous hit count. If you use Astral Saintstrike as your first attack for the turn, the first hit will have a 1.00x multiplier, then 1.01x on the 2nd, 1.02x on the 3rd, and so on until it hits 1.14x on the 15th. Additionally the multiplier is preserved between attacks, so the next damaging attack used after Astral Saintstrike will start at 1.15x.
This is particularly strong because in practical setting, you can definitely setup stuff like 3 or 4 saintstrike in Strategize Arahabaki strat. You can see me pop Succession Aramasa for building up the hit count and then use Blur for damage. So far, there is no hard cap for this hit count multiplier. You also see me shelve Huang Long in the end and my damage drop considerably.
Also, Huang Long doesn't even need to be in the main team for this. He can just be in stock when you pop the Omagatoki. You can build up your hit count first and when you want to do big damage, bring Huang Long in since even though the HIT COUNT still goes up, the damage multiplier doesn't apply until Huang Long is in the main party. That is probably the main flaw of this I guess.
Zaou Gongen is the biggest one to receive this discovery since he got damage boost based on party hit count after all. Although you need really high hit count for him to overtake Gogmagog but its been done. This discovery is so strong that 2 Turn Satan has been done and I heard 1 Turn also has been done as well (need confirmation on this part).
In all honesty, this setup only replace Xiezhai in gogmagog setup but you need high hit count to do so. If you have Dagda and Danu, their Magatsuhi skill allows you to rack up really high hit count thus allowing Zaou or Gog to do huge damage.
If you'd otherwise be attacking with Gogmagog 10-13 times, it becomes optimal to use Astral Saintstrike 3-4 times beforehand, then use Gogmagog Figment with Huang Long for the rest. At 14 total attacks, it becomes optimal to use 8 Astral Saintstrikes + 6 Figment Slashes, and to use Zaou-Gongen instead of Gogmagog.
There is some very mathematical method between what should you do between using zaou or gogmagog but short version is...
1-9 attacks = don't bother (use gog xiezhai instead)
10-11 attacks = 3 Saintstrike + 7-8 Gog Figment
12-13 attacks = 4 Saintstrike + 8-9 Gog Figment
14+ attacks = 5 Saintstrike for every 3 Zaou Gongen Figment