Center Children in Layout

Hi, We tried your Parallellayout example, After adding few more nodes and branches it looks like as below.

As you can see Nodes S, J, FFF, 0 and * are not aligned with base line (imaginary).
and same case with second red line.
As we keep on adding more nodes and branches, it results in more elbows.
Could you please suggest any solution to correct it.

Thanks in advance.