Dynamic slicer columns

Hi,

I have a table 

I want calculate 3 new columns. 

Max = Story point * Low confidence multiplier

Min = Story point * high confidence multiplier

Medium = if (confidence = High then Story Point * High confidence multiplier
  Elseif confidence = Medium then Story point * medium confidence multiplier

  Else Story point * medium confidence multiplier

I then want to dynamicaly update through slicer the confidence multiplier for each level of confidence, hence I created three disconnected parameter tables

The result should look more or less like this, where with each change to confidence I would see update on the chart

When I tried to measure with following formula, I get blank results. 

MD Minimum M = SUMX('Work Items - Today',
                'Work Items - Today'[SP MD] * SELECTEDVALUE('High confidence multiplier'[High confidence multiplier]))

I also tried a column

MD Minimum = 'Work Items - Today'[SP MD] * SELECTEDVALUE('High confidence multiplier'[High confidence multiplier])

but also blank result

What am I doing wrong?

Thanks for help

Best

Marcin