Some of the comments indicating that you need to understand you have little control over the ads from Google may be true.
If you think about it, placement of ads from Adsense is a contest. Not only is the type of placement a contest (you really can't predict what kind of ad is placed unless you eliminate all categories of ads but 1!), but I have a feeling the crawler continues to look for different things based on a rapidly modified algorithm. Perhaps the crawler reports back and the algorithm does the "dirty work" - I am not a swell-enough computer dude to really understand.
What you are frustrated by is something I think most Hubbers are experiencing. I seem to average about 4 cents a day, if that. Periodically, I get a click and then I jump to, perhaps, anywhere from 6 cents to $1.50. But I figure that happens once a month at the best. I think the key is not to dislike Adsense (because there are a lot of people making big bucks from it - that's why it is so popular), but understand it for what it is. Then you can make money from that "epiphany".
Google wants to maximize its profits. That's fair - it's a business! As they get bigger (it seems they never stop getting bigger) they put more conditions on where and what they attach to your articles as far as ads.
You can continue to have Adsense be one of your advertising choices in settings, or you can simply go with the HubPages Program. I feel confident you will make more money, but I am not sure what that increase would be. On the other hand, if you have articles all over the place (that have an Adsense connection), you could stick with it in hopes that the variety of your work/websites, etc will affect the algorithm in some miraculous way. Those of us who write must accept a degree of "blindness." Some of the people here are really good with computers and they may have insights stronger than mine, but that is how I have to look at it.
I hang with Adsense and the HubProgram and watch the stats at Adsense in hopes that I can understand Adsense better. Reading your comment is familiar and guidance is difficult to give. But one thing is for sure, unless someone clicks on an ad, you are looking at compensation from RPM dependent on views. That is always going to limit income. You are not alone.
When someone comments on how to make money writing for Google, you can bet I too will be reading and paying close attention. Until then, I accept that Adsense is the whale and will struggle on. Hope this helps.