I haven’t found this metric to be useful outside of gauging quality scores, but with a sample size so small (1 click = a 16% CTR) It’s hard to tell if your CTR will actually be much higher than they think it will be. Do what you can to boost impressions and get more data before deciding if you have a CTR problem. Overall, I don’t think you need to look too thoroughly at this metric, you’ll know if your CTR is actually in trouble soon enough!