The foot-on-pedal method is clearly stated to be only a starting point, and thus it requires senstivity and fine-tuning after you make the setting.

The Ginet equation method does not consider many matters that might be important, hence it requires sensitivity and fine-tuning after you make the setting.

It seems to me that they are essentially equivalent in results, except that with the foot-on-pedal method you don't need to do any measurements.