For the snipe I would say Pintail/Swinhoe's: these have paler shoulders and thinner eyestripe at the lores on average. The warbler looks good for Oriental Reed Warbler; the Kestrel has a prominent moustache, and if the diamond shaped tail and yellow claws aren't seen well it's very hard to argue for a lesser kestrel in Hong Kong given its range ^^". But we're always in for surprises, aren't we?