Word Cloud - Top N and Invert Size

Hello,

I have a question regarding "Word Cloud" custom visual. Let's say in my table, I have a column for "Keyword", "Cost" and "Clicks". I then create the following measures:

[Total Cost] = SUM(Table[Cost])
[Total Clicks] = SUM(Table[Clicks])
[CPC] = DIVIDE([Total Cost], [Total Clicks]) // Cost-per-click

I then add the Table[Keyword] in the "Category" section of Word Cloud visual, and add [CPC] in the "Values" section. All works fine, I see the keywords and size of the keyword is based on [CPC]. Bigger the CPC, bigger the size of the word and vice versa.

Questions:

1. I want the size word to be inversely proportional to [CPC] i.e. smaller the CPC, bigger the size of the word.
   • I could multiply the [CPC] by -1, this will solve the above problem but then the Tooltip shows negative CPC which doesn't make sense and confusing for the end user.
2. Let's say I have 1000s of keywords in my Table. But I only want to show Top 20 keywords based on the CPC, making sure above point(point 1) holds true.

Any ideas?

Thanks,

Shiv