poundpyramid.com - ad performance query

[bilbo3]

My site has been running for well over a year now and receives significant traffic. However following advice in another forum, I have made a progressive change from google ads to more visual custom ads. Since it is in the best interests of my clients that these perform well, I would like the best return on page space. However, contrary to what seems logical to me, the more visual ads fare worse than the google ads in terms of revenue. I have tried to select only relevant ads, any suggestions?