Staying behind and to the right is fine, if they suddenly pull in, you just swerve to the right and go past and be on your way, at a slightly higher speed than normal =P
I hope by "swerve to the right" you mean "leaving sufficient distance to complete a headcheck for trailing vehicles and move over" because otherwise you're gonna get killed by a car overtaking the bus when you swerve out.
I hope by "swerve to the right" you mean "leaving sufficient distance to complete a headcheck for trailing vehicles and move over" because otherwise you're gonna get killed by a car overtaking the bus when you swerve out.