There is no relationship between your air fuel ratio and timing.

The high octane timing table has rpm on one axis and grams/cylinder on another.

Grams/Cylinder is calculated based on the Grams/Second value that is provided by the MAF. As G/C gets higher, your timing typically drops.

So, altering your MAF table could impact the cell you select for a timing value. Not the way to dial in your car.