The problem is that at set voltages lower turn (higher KV) motors produce more power.

However it is possible to go down in kv but still produce the same power by using a larger motor.

My 540 8s and the 540 7l i have ordered have similar resistance and current characteristics which enable them to produce nearly the same power at a certain voltage. The pure difference ignoring the extra weight is the higher torque and lower rpm which should hopefully mean that the 540 7L will be more efficient on 3s lipo than the 8s.

I look forward to receiving my motor I have in fact bought a spare xxxt transmission in anticipation of the strain on the transmission.