More suggestions
When raiding remove should be disabled for 3 min from every attack on building ! I saw this one to on other server
you cant raid if defender removes your stuff ! he can still build so thats should be enough ! This way people can raid only if player is offline and thats coward way :p
Other suggestion is TPA limit it to 5 per day , so when raiding or anything people cant grief with teleport ! You cant Tp in real life when you die :p
So if limit to 5 then it means in groups its still more 3 player 15 tp