Hello Massimo,
it is too long answer for my bad english
) . So, I write you my personal meaning.
65,5cm high dog is good. 73cm high harmonic dog is good too. Is not different in using them for females. But: how much people want puppies from 65,5cm high dog? More people want puppies from higher dogs. For 64cm high females are good both males 66cm and 73cm high too.
So, high is not important.
But I want know more opinions from other breeders.