If you see reasonable looking 9 item lists appearing in the data collection List View, then all you need is to apply Select Item from List blocks to map the intList into your Labels.
P.S. From your description, I would expect to find acceleration X,Y,Z in items 1,2,3 of int_list.
I don't know about your |a|. Are you taking the diagonal, or just the max of the absolute values of X,Y,Z?