Which Ads in a group to delete?

total four ads in one group. All have different metrics.

[freedata]

Hello All,
I have a campaign with one AdGroup. This Ad Group has four ads. All point to the same destination, use same KWs. Just the ad text is different. Yet I have vast differences in number of clicks, servered%, CTR and CPC. Why does one ad gets server more than the other within the same Ad group?
If I can delete one or more ads to improve my CTR, which ones should I delete? The Ad3 with low CTR?
Any other suggestions/advice on which ones to keep?

Ad1 -> 14 Clicks ¦ 1.7% CTR ¦ $0.28 CPC Served - 3.3%
Ad2 -> 51 Clicks ¦ 1.3% CTR ¦ $0.29 CPC Served - 15.8%
Ad3 -> 37 Clicks ¦ 1.0% CTR ¦ $0.27 CPC Served - 13.7%
Ad4 -> 172 Clicks ¦ 1.0% CTR ¦ $0.28 CPC Served - 67.2%

PS
I have turned on both content network and search.
Thanks

[RedWolf]

If you would like the ads to be served the same amount (25% each) then you need to uncheck the option to optimize ad serving. Then you can get a better idea of the true results of the ads. Also, try to track the converions and ROI on the ads so that you don't kill your money makers even if they have a lower CTR. High CTR is good for Google, high conversion is better for advertisers.

[freedata]

Thanks RedWolf. That makes sense. In my case I don't sell any product, so my ROI is proportional to how many visitors I get.