Typically, babies get better able to handle overactive letdown as they get older - mine was a lot better with it at 3 months. Sometimes how they handle the letdown is to allow milk to dribble out of their mouths, which can result in "milk bath," but it's a good way of coping.
Block feeding has worked great for us. No harm in being lopsided - everyone is to some extent. There's no harm to producing more milk from one breast.