When I implement the responsive unit it shows up fine on the mobile but it displays the small 460 by 90 banner on the desktop and tablet. This unit has a low CTR. But when I use the 336 by 280, which for me has the highest CTR after plenty of testing, it shows up great on desktops and tablets but not in mobile. You can see the dilemma here. If I use a responsive ad then I am getting perfect looking ads on mobile but not on other platforms, but when I use the ad which has the highest CTR it doesn't render properly in the mobile. I thought the whole idea was that the responsive ad would make use of the extra estate and show up bigger ads on desktops and tablets.