You have those set as broad modified and still have $20+ CPC? Interesting. I'd take a look at the auction insights report to get a good idea who and how many people are bidding on that keyword(s).
Sometimes If I have high CPC keywords that I want to keep I'll go ahead and make a separate campaign and put each keyword in their own ad group. This will allow me to have further control over the Keyword+ad text relevance and Keyword+search query relevance, which in turn will boost my Quality Score and eventually lower my CPCs.
Sometimes If I have high CPC keywords that I want to keep I'll go ahead and make a separate campaign and put each keyword in their own ad group. This will allow me to have further control over the Keyword+ad text relevance and Keyword+search query relevance, which in turn will boost my Quality Score and eventually lower my CPCs.