Thank you very much for sharing this option. It is not one in my large rotation and I certainly will give your route a shot in the near future.
There is one factor that isn't considered above as it relates to the comparison of chest running at Pongmei, the main reason players chest run at Pongmei is because the chests can drop Max Q8 Swords, Shields, and Foci in NM. With the ability to hit 5 chests in a rather quick run, this does make it the most effective chances of Q8s with a very large variety of skins as it spans both factions and a large variety of Mobs. Q8s cannot drop from the Eternal Grove chests due to the level of the chest is too high, as a result this becomes not an option for this particular purpose.
If chest running for the purpose of title, Pongmei NM is no longer an option, only HM is. This is where your run option in Eternal Grove comes in as an alternative option. I understand that NM is easier, however most players will want to run in HM for higher chances of gold drops at the same time. Other players like myself already have max titles so we would be only after good drops which would make HM the only option. This highly intrigues me for the focus on different skins especially those that drop from Forests, everyone dreams of that ultimate Guardian of the Hunt!
Thanks again for sharing, I will certainly be adding it to my list.
Chevy