I'm brand new to this server as well and it's really hard to find guides or discussions for Transcendence builds after the skill rebalance. So I'm experimenting with a ME priest as well and I'm thinking 9x int, 8x dex, 6x vit.
Right now my priest is lvl 80 and has 6x dex. ME doesn't feel slow at all with around 3 seconds casting time. So I may consider stopping at just 7x dex and getting more vit instead to make Kyrie last longer. I feel that ME's casting time is now low enough for Kyrie to be viable over Safety Wall. I'm not sure if this is the best build because again, I haven't found any updated guides.