Depending the need / objective of the total setup, one thing to be considered:
a perfect mixture at stoichiometric condition will burn the hottest
The lean burning flame, as seen in the clip, is the coldest flame
I am building something “similar” with the objective to have a clean burning flame for direct fired dryers in the food industry.
The low temperature prevents the Nitrogen to form Nox
The total heat capacity is “the same” , the temperature drops equal to the amount of air increasing
For my purpose, drying rice powder, the perfect gas is from gasification, pure CO, as this does not produces moister on combustion.
I will most certainly look deeper in this clip / inventors work