Bottom 10th product sales amount value optimization

[f1254lipm]

Hi, I need a little bit of help to optimize a measure that always gets the 10th bottom product sales amount and reacts to only specified filters. I created the measure on sample columns and data so I can show the current measure definition. The measure is used for example in a table visual where only the top 5 customers by sales amount are filtered but I don't want the 10th bottom product sales amount value to be affected (filtered) by the top 5 customers filter or any other filters with the exception of a filter that I defined in the measure (in this case Education) because the value of the measure is then used in another measure where I add this value to value of other simple sum measure. Is there a way to optimize this measure and at the same time keep the described behaviour.

Thanks

The measure:

Nth-Product Sales Amount Dense =

VAR ReferenceProducts = ALL ( DimProduct[ProductKey])

VAR ProductsAndSales =

    ADDCOLUMNS (

        ReferenceProducts,

        "Rank", RANKX (

            ALL ( DimProduct[ProductKey]),

            CALCULATE(CALCULATE([SalesAmmount],ALL(FactInternetSales),VALUES(DimProduct[ProductKey]),VALUES(DimCustomer[EnglishEducation]))),

            CALCULATE(CALCULATE([SalesAmmount],ALL(FactInternetSales),VALUES(DimProduct[ProductKey]),VALUES(DimCustomer[EnglishEducation]))),

            ASC,

            Dense

        )

    )

VAR FilterNthProduct = FILTER ( ProductsAndSales, [Rank] = 10 )

VAR NthAmount = MINX ( FilterNthProduct, CALCULATE(CALCULATE([SalesAmmount],ALL(FactInternetSales),VALUES(DimProduct[ProductKey]),VALUES(DimCustomer[EnglishEducation]))))

RETURN NthAmount

[lbendlin]

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