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Showing direction arrows on hierarchical data

I have a set of data with a custom hierarchy (anonymised sample below


What I need to be able to do is display the data in a grid with a final column that shows the upward or downward movement at each level, with level 1 being the highest and being a sum of the levels below


Level 1Level 2Level 3Level 4UFW_DECLastWeekUFW_DEC
Level 1_3Level 2_1Level 3_36Level 4_3211747.749533589.94248
Level 1_2Level 2_2Level 3_17Level 4_65727.3781106.822
Level 1_2Level 2_2Level 3_27Level 4_122529.94529.94
Level 1_2Level 2_2Level 3_35Level 4_1371600.152193412.31348
Level 1_2Level 2_2Level 3_65Level 4_254367.1359.84043
Level 1_2Level 2_2Level 3_67Level 4_308395.08202728.55774
Level 1_2Level 2_2Level 3_71Level 4_285235.73212519.71943
Level 1_2Level 2_2Level 3_80Level 4_89626.86009900.00289
Level 1_2Level 2_3Level 3_77Level 4_3723600.3855533.42029
Level 1_2Level 2_2Level 3_27Level 4_9660.73558167.01732
Level 1_2Level 2_2Level 3_10Level 4_30121.461.01429
Level 1_2Level 2_2Level 3_10Level 4_38214677.83715
Level 1_2Level 2_2Level 3_67Level 4_272-1215.53859-603.25036


I have a calculated column showing the difference between this week and last week and another one with this formula


    Main[Change]=0," ",
which I found on another site.
The trouble is, it doesn't work, mainly I think because using a matrix, this new column is always forced to 'summarize' and with it being a string it defaults to 'first' (first of what though, and in what order).  It tends to show only onw arrow (the down arrow) and sometimes shows blanks when clearly there isn't a change.  Obviously doing something wrong but having trouble understanding the logic. 
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PS I tried this too

    Sum(Main[Change])=0," ",

PPS the CF I created to colour the arrows red or green seems to work fine so I'm thinking it's the 'first' summarization that's causing the problem

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