By reducing 2 cells, you would be reducing 33% of power.
By reducing 2 cells, you would only be reducing <100g of weight which is less then 7% of total weight.
So your trying to tell everyone that by reducing 2 cells, you would reduct amp drawn? No offence but after losing 33% of power, the motor will draw HIGHER amp just to make sure it moves. In turn the motor will run HOTTER.
Then it would kill run time.
If everyone believe that running 4 cells would be better overall, they should run with 1 cells then.