I'm sure it has a lot to do with duplicate content. try searching for unique strings from your site and see what you get.

I used (quotes) "Welcome to Your Discount Printer Ink Store" and got 27 results.

I tried other searchs and found that your "other" site (printecartridges.com) comes up first or near the top. For example, I searched for (no quotes) "printcountry remanufactured environmentally conscious" and got 1-5 of 21 results with duplicates omitted. Guess what? Printecartiges.com shows up in #1.

Click on the link to show duplicates and now PrintCountry shows up on top with the most of the 132 results. All have different "?ref=" codes. I also see printeink.com and print-country.com in the results.

I think you really need to manage your redirects and duplicate content first, and then see if you can show up earlier in the listings. I'm sure the penalty of position 31 is a direct result.