Block chart fractile upper/lower limit exceeding memory

[#1]

I have values like

Country	Value
	0.17
DNK	3.53
ITA	1.16
DEU	0.73
MEX	0.73
JPN_ROW	0.54
SWE	0.52
NLD	0.48
FRA	0.39
KOR_ROW	0.33
KOR	0.29
JPN	0.28
FIN	0.25
AUS	0.24
MYS	0.22
SGP	0.20
GBR	0.20
CAN	0.20

Using the colormix wizard with Sum(TotalConvValue), default normalised upper and lower limits produces a very uniform color block chart  except for 1 patch since the DNK value skews the whole table.

If I set the upper and lower limits manually with Fractile(Aggr(Sum(TotalConvValue),Feeder),0.9), Fractile(Aggr(Sum(TotalConvValue),Feeder),0.1), the chart throws an allocated memory exceeded error.

How do I overcome this for a nicely distinguished heat map on the block chart?