Its when you throw twinks into the equation that everything becomes a mess. There is absolutely no chance that a level 10 can defeat a twinked level 19. Its not even close, even with bolstering. If this is the way they want it to be, what then is the point in even having a 10-19 bracket? This isn't exclusive to the 10-19 bracket, I'm just using it as an example.
Unfortunately, the twinks want the advantage over other players. The idea of balance is punishment to them. Arenas could be a solution but that requires participation by the twink community, which would be like trying to herd cats. I think it IS an option.