Hi Dave,
Some excellent records here Dave, especially the wader counts etc during your stay at Beidiahe (I've just returned, an interesting Spring with many late migrants Waxwings, Grosbeaks, Buntings etc with some classic overshoots such as Grey-headed Canary Flycatcher, Grey-backed Shrike etc).
The first warbler in post 9 is an Eastern-crowned IMO, the strength of head markings, bill and more significant, the lemon yellow undertail coverts and flank point to this species. Two barred Greenish tends to be a later migrant, arriving towards the end of the Yellow-browed movement though there are always a few that bend the rules. Congrats on the work on Black-faced Spoonbill and especially on the Gray's Grasshopper Warbler, a very difficult bird to get in NE China.
Hope your going to send these records in to the China Bird Report, it all helps in providing some ammunition to try and protect these sites in a current environment where change is just a blink of the eye!
Mark