Well, i never used your build, but i can sort of guess why it not working, i am guessing he has more refines total and he gets field advantage so Mei is kinda wasted and you don't touch Narutos hp much, maybe with Ao for 2k~ dmg.
With Shurado instead of Mei, he does twice more dmg with his 3 chases, also his rocket will do 4k+ to that Naruto turn 1, the ignite tick will be 1.7k~ and the actual rocket would hit 2k+ for sure and if you can get away with Aoing him as well, that Naruto should enter turn 2 with 8k~ hp.