Sometimes a keyword is doomed from the start because it historically has a bad ctr whenever any account has tried to use it.
Does the fact that landing page says 'No problem' means that google thinks that it is related to the keyword or is that simply checking that the page exists and can be accessed!?
3 Ways that will help you to increase your quality score: 1 - Split Keywords into Smaller and more targeted Ad Group. 2- Create relevant ad copy for each group 3 - Put your keyword in the meta tags