Playing China again after a long hiatus, I personally don't think its China's strong start (per say). The trick with China is....you can very easily get permanent WLTKD in all of your cities by mid game, and if you combine that with WLTKD synergies, you are going to skyrocket.
Give them the WLTKD religious bonus + the religious building, and they take off like a rocket. I personally think we are nerfing the wrong thing. Instead of reducing the food and gold bonus at the era changes, I think there empress days should be reset to 0. This at least gives some incentive to kick those back up in later eras, instead of just leaning back on an infinite WLTKD run.
I was about to start a china game (and I like to play wide)
Lots of WLKD, good for very early game because of the fast growth and the extra gold is welcome.
Papermaker +10% gold during wlkd and 1g/4pop is ok but the one culture from a "library" looks like a bargain.
The Chu-Ko-Nu looks mostly like a defensve unit and splash is a bit meh until you get range (then its still mostly to get the AI to retreat units).
For religion Theocracic Rule (15% faith, culture and gold), Synagogue (10%science) gain yields from WLKD.
Looking at your post it seems worth to build a religion around WLKD.
Any other religious option that are very strong for china?
It does look very Tradition oriented, since creating great works also produce WLKD.
Are the bonuses and GPT enough to make a gold monster out it? Theocratic rule, cathedrals?
Of course any religious "must haves" in a strat is dicey since they arent a garantuee.
Maybe its better than it looks....
edit: I guess rushing mausuleum is also great