it is very common in Chinese wedding.
What i normal do on top of the above mentioned,
1. Take multiple shots as people's eyes may be close. I rise my hand and say "ok, look here, 1.2....3"." or something along that. make sure that when i shoot, i am the only 1 having all their attention. if uncle bob is next to me, i let him shoot first. if not, u get half the people looking elsewhere.
2. Things to note is. NONE of the people are block by the table centrepiece, flowers etc. NONE of their faces are block. If there is a tall centre piece, move to the side. Oh, i get half of the table to move and stand behind the other half. I make them squeeze tight together. Add a flash if needed to bring the shutter speed up. point it upward and bounce it.
3. Cautious if wide angle lens is used. Distortion at the side mau occur and people dont look gd distorted.