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If you had a booming hive, and a hive that is struggling, the donor frame is a no brainer. In this case however, I would not want to risk the strength of your other colony, which at only 6-7 frames is not exactly thriving. Why don't you see if one of your local guys will sell you a couple frames of brood and eggs? Transport them in a nuc with the nurse bees, and install. Just my opinion. (Remember....Ask 10 beekeepers the same question, you get 12 different answers.) 
Good luck with them!
Good luck with them!