TopCount Help!!!

[tschuman13]

I have run out of ideas and I need help with a report that is 95% complete. I am using a PowerCube and C10.

Some background info:

Dimensions in the cube (for specific report) are:
Group -> Company -> Issuer
State
Coverage Type

Measures (for specific report)
Group Category Count
Premium Amount

I am using a list report due to the requirement to show a "text/string" value in the body of the report.

The report has the following columns:
Coverage Type (Group By) / State Name/ # of Groups in State / Name of Largest Group / % Premium of Largest Group/ % Premium of 3 Largest Groups/ # of Groups that make up top 90%

I have everything working except for the Name of Largest Group. When I try to calculate this, I can get the right value but all other calcs break and give just the value for the largest group. The function I am trying to use is:

item(TopCount(set of Groups, 1, Premium),0)

The function I am using to get the other values are variations of this:

aggregate(Premium within set(topCount(Groups,1,Premium)))

count(1 within set(topPercent (Groups,90,Premium)))

So it looks like the within set scope keeps the report from filtering all results. Is there a way to bring back the 1st member and display it in the same report?
Thanks in advance for any help!