Increase the Hardness setting to 15 grains per gallon to anticipate some additional capacity being utilized beyond that needed to remove 12 gpg hardness and 0.318 ppm ferrous iron.
You didn't specify the Brine Line Flow Control rate (normally stated on a label located nearby to the brine tube connection).
Assuming the BLFC flow rate is 0.5 GPM, your current 10-minute Brine Fill setting will result in 5-gallons water entering the brine tank during each regeneration cycle. As 3 lbs salt will be dissolved for each 1-gallon, the current BF setting will result in 15-lbs salt being dissolved each cycle. In addition to an insufficient quantity of salt to regenerate the full 32,000 grains capacity (would require ~20 lbs salt), 32,000 grns usable capacity from 1 ft2 resin is not realistically achievable since resin becomes worn and broken over time. Smaller and lighter resin granules will be flushed to drain during ongoing regeneration cycles, thereby resulting in the total resin capacity to be less than 32K grains over the resin's lifespan.
To program a more realistic usable capacity while also increasing salt efficiency, reduce the Capacity setting to 24,000 grains, and reduce the Brine Fill setting to 6-minutes. 6 minutes X 0.5 GPM = 3 gallons fill X 3 lbs/gallon = 9 lbs dissolved salt. 24,000 / 9 lbs = 2,667 grains per lb Hardness Reduction Efficiency.
If your actual BLFC rate is an alternate rate, then the Brine Fill setting will need to be adjusted to compensate. For instance, if the BLFC rate is 0.25 GPM, then the Brine Fill setting will need to be 11-minutes to dissolve 8.25 lbs salt.
Because more of the resin's capacity was likely being depleted than was being regenerated, after adjusting the settings, use a bucket to add 1-1.25 gallons additional water to the brine tank, wait 1-hr to allow additional salt to dissolve and then perform a manual regeneration. The additional brine will result in additional depleted capacity to be restored, thereby resulting in lower ongoing hardness leakage through the resin even as subsequent automatic regeneration cycles are almost due to occur.
The current reserve setting is based on 10% of the 32,000 gr capacity setting. Suggest changing the Reserve setting to 150 gallons for 2-ppl.
The 60 gallons per day per person is an average usual water consumption estimate for home's equipped with low flush toilets and efficient fixtures. If your actual water consumption differs, the Reserve setting maybe adjusted as appropriate. The 150 gallon suggestion instead of 120 gallons should reduce the potential for more capacity to be used than will be regenerated, in case the final day before regeneration is laundry day and so more water than average is utilized that day.