I see a few problems that stand out instantaneously when looking at your account. First of all, only three of those five hubs that you've mentioned are "featured," which means that the other two aren't showing up on your profile. In order to get those hubs "featured" you need to improve them to the point that they are acceptable by Hubpages standards.
The second problem that I'm noting is that your hubs aren't optimized for ads. Ideally, you want the ads to show "above the fold" which means that your visitors don't have to scroll down the page before seeing your ads. If your ads are above the fold they are more likely to get clicks even if the visitor doesn't stay on your page.
The third problem is that your hubs may not be related to subjects that are optimal for earning. You want to write about things that have high earning potential. You can use a keyword tool to determine how much Adwords users are paying Google for clicks on your ads. Ideally you want these to be high amounts since you only receive a portion of it. $5+ dollars will get you started but there are users paying $20+ for clicks, so those are the ones you really want to go after, since it takes fewer clicks to earn.
There are a couple of other things to take into consideration here.
1. You only get 60% of ad impressions. You may be earning clicks, but those clicks may be attributed to Hubpages' ad time.
2. The number of people visiting your page is irrelevant. The number of people /staying/ on your page. If your "bounce rate" is high, you're not going to earn because people will use the back button. You need to keep people on your page. Try adding videos and polls.
Hubpages isn't perfect, but in one year on 5 hubs, 2000 visits isn't a very high number either. It looks to me like you need more copy on your pages and that you need to optimize that copy for search engines. After two years I finally started to earn enough to make payout every month. After three years it's down again. But I have confidence in my ability to bring it back up!