Hi Ben,
There's a little limitation to that workaround because of your requirement, you can't really reduce the height of the cell if it's at default height. You can add cell height dynamically. So, keeping that in mind, you'll have to increase the height of Rows 1,3 & 4 should be increased which will make it seem like Row2 height is reduced. Makes sense? So, you can write a formula dor that column as
=If([Column] <> "Row2") Then (Char(13)+[Column]+Char(13))
Else [Column]
Here, Row2 is the value, whose cell height should be reduced.
Let me know if you've any questions. Also, the other thing you might want to reduce is the Alignment, to see what it does, create a table with just one column (any column), right click on it -> Format Cell -> Alignment -> change top and bottom as 0.05cm, and click OK and see what happens.
Also, for the Waterfall Chart, mark the discussion as answered, so people have better visibility about answered or unanswered discussions.
Thanks,
Mahboob Mohammed