For best ctr results, place an ad on the left sidebar and on the top. As for the cpc, obviously you have a low paying niche plus youre receiving social media which doesnt pay as high as search traffic. Looks pretty normal.
We've been testing social media a lot and can def say it can pay a little lower, but not all the time. Social media is capable of providing $3.00 per click with high paying niche and displays on.