I am really liking my set of Flight Powers, they have much more oompf, and have ordered another set... but with only 12 cycles I can't attest to longevity yet. My TPs have a lot of use on them and still going strong...
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I'm having trouble understanding why you use less energy with one set of batteries vs. the other. You either are getting lower voltage, (lower rpm), or less current, (less torque), or both. The efficiency of the motor and esc are not affected by the battery pack, so the loss must be in the battery. That would suggest less oompf.
Is there a big difference in weight so the airplane requires less energy? Is the cooling drag different? There must be an explanation.

Jim O