Just curious - is it possible to exclude the totals row and column generated by addtotals and addcoltotals from the heatmap visualization? They always show up as the hottest things on the map, distracting from the values which are actually important.
It is not really possible in a "good" way.
You can defeat the inclusion of these values in the heatmap calculation though, say by evaluating them to look less like numbers. For example, add to your search
| eval Total = Total . " ." You could pick an arbitrary character here to make it not look like a number.