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Don't worry about that magical 3rd card right now. Concentrate on keeping the 2 you have now in good standing. The third card is needed for optimum scoring, but is not necessary for improvement of your file. Given 6 months of good history on those 2 cards, I would bet you will qualify for a better 3rd card.
I started rebuilding with one Cap1 card with a 300 limit. After 5 months of charging and paying a few times a month, that increased to 3.3K. It was a year later when I found this site and learned I needed 3 cards for the best scoring. At that time I was able to get the CFU and a low interest card from my local CU with a little begging. I have also started getting some better pre approvals in the mail with the improvements from the Cap1 card.