+1 on Steve's comments.. On 7" props and 2 cell batteries you will hardly have enough thrust to lift the weight of the motors!.. ok this may be slightly overplaying it but you certainly wont have the preformance you are looking for unless you use the right size props.
Given that you have the motors already and you probably dont want to buy new ones.... If you go with a 3 cell battery and use a 3 blade 7" prop then you should get the motor somewhere near it's optimum performance.
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