You can splay them open a bit to get more light to the lower areas. You can also ponytail the new too growth to get more light to the lower reaches. Both of those techniques will have help the growth balance out. As they get taller you can restrain the tallest point below the rest of the plant and this will also slow vertical growth in favor of letting the side growth catch up.
You have many LST options.
You have many LST options.