goto http://www.google.com/sktool/#keywords
at the bottom of the page you will see the link 'http://www.google.com/sktool/#keywords' << click on it.
In the left you will see categories. Click on them or the specific one you are trying to operate in and then sort the results by suggested CPC.
Those one at the top are the high paying places to be. However, note that this is for all keywords, not just content network, which is where you are.
It's best to target the general category instead of a specific keyword. Then you can expect more of the higher paying ads to appear more often.
To be frank, the highest paying terms are the ones where there is a lot of competition, and a lot of profits to be had. You don't need a tool to tell you what those are, just think about the biggie industries. Insurance, banking, credit, health, education and so on.. all big tickets with big companies and big budgets they need to spend on advertising to keep their milk machine going (by milk machine I mean.. to milk you

). $1 clicks is a norm in those industries in the content network, and sometimes even $2 to $3 clicks.
On a side note.. your site is too new for it to deserve the higher rate clicks. Smart pricing only kicks in after a week. If you have your adsense on other sites that are not performing, take them off. They will drag down your potential EPC because smart pricing is calculated based on total Adsense account performance, not per site performance. So one bad site can drag down the earnings of your good sites. Some estimates suggest this can increase your earnings by as much as 15-20%.
At this early stage, I recommend you take your eyes off the nickles and dimes, and keep focusing on how to turn out more traffic. You can figure out how to best monetize your traffic after you learn how to get it, instead of trying to figure out how to get more from so little.
3-4% CTR is perfectly acceptable without any tricks involved.
This advice is almost two years old, but it would work just as well today for what you are doing:
http://www.blackhatworld.com/blackhat-seo/making-money/49601-how-seize-traffic-your-site.html
Apply some of those methods to your daily routine and I am sure you will do fine.
Don't abandon the sites you have done to create other ones. Sites are babies. They need to be fed, changed, and burped. You abandon it or give it too little attention and it doesn't grow much, or worse, dies. It's tempting to turn your attention to another site thinking it might turn out better results than what you got.. but like I said, learn the ways of traffic generation first.
Pay attention to all you learn from what you are doing. You are going to need to reapply it all later. Consider the sites you are working on now as assets that will be able to contribute to other more profitable projects ion the future (ie, they will make great link fodder).
Brushing twice a day is a good idea.
Removing the clutter in your room is a good idea. Your environment is a reflection of your mind space.
That's all I got to say about that.
Mister Gemini