I agree with Richard about lowering the ALK but for diffrent reasons. I think the outgassing of CO2 is a major player but not the only player. I feel each pool has its own buffering based on the water in the aera, filtration system, and environmental factors.
I found running my ALK around 60 to 70 reduced my acid use to about 1 pt a week from a little over a 1/2 gallon a week
Just remember our pools are diffent and your pool may need a diffrent ALK for a stable pH.
Steve