Neutral flame is what type of flame with a balance of oxygen and acetylene?
You should ask a welder for his input. And goddammit I am a chemist.
A neutral flame is neither oxidizing nor reducing; the stoichiometric proportion of reactant gases are fairly well balanced:
So the oxygen bleed is greater to achieve stoichiometric proportion.
Again, this is a practical issue; the welder adjusts the oxygen and fuel valves so that the flame reaches a purpose-specific temperature under a reducing (tweak the acetylene valve) or oxidizing regime (tweak the oxygen cylinder).