Assistance with filters on crosstab

Hi,

I'm looking for some assistance on the best way to make some columns in report builder. Right now, my query has a column with standard names such as below (which are specified as parameters):

I'm trying to make them in to columns as such (i.e., each unique value as its own column):

The problem is the group isn't filtering properly (NS's should only turn up for NULL values, and actual numbers should show based on the corresponding substance). My code is below, and it works correctly as a filter on one standard:

but when I try the same with two, I don't get the expected result. I'm adding the second standard as a child group of the first one. Any suggestions?

=((UCASE(Fields!StandardName.Value)=UCASE(Parameters!Standard1_Bold.Value)) OR (Fields!StandardName.Value IS Nothing))