I think we've had this conversation before and to be fair, there is never going to be a perfect system, although these 2 things might help:
1. The judges are not sat ringside because a. Being right under the action isn't the best view to judge from and b. At ringside they can be influenced by the crowd and the boxer's corner/team. They should be sat in front of TV Monitors in a quiet room and are not allowed to talk to each other.
2. I thought at the Olympics , they had a brilliant idea where 5 judges judge the fight , but only 3 cards were picked randomly at the end of the fight. I thought that was genius , but as we saw in Rio , even that wasn't foolproof.
Like I said, I'm afraid there is no perfect system.