Here is a simple setup. (I have exported parameters just to show what have I changed in the transforms operators).
A simple box segmentis composed in a group mode.
Added transform for X Size and then set a Sequence with another Box Segment.
The problem is when X Size is set after Compose, the whole compose is miss-aligned.
An easy fix will be to set the same size into any of the Compose`s-Child Segments but since this kind of Compose should be used as Input to a Macro I can't return the calculated value from Macro`s Graph Back to the original segments.