How do those settings look?
While there are some double backwash 5600SXTs, they are fairly rare. Do you have reason to think you have one?
How much iron? That affects DO. If no iron, you could raise DO.
I bumped H to 24 to include high hardness compensation. If iron, increase more.
For the reserve, I selected 120 gallons. Adjust that if appropriate. Your method had 5%. That method is harder to understand, and requires tweaking if you change other settings. I also presumed single backwash softener.
System info (not programmed)
salt lb/cuft = 8 ; A choice ( efficiency vs capacity)
BLFC = 0.5 ; Brine Refill rate GPM
cubic ft resin = 1.5 ; ft3 resin = (nominal grains)/32,000
Raw hardness = 24 ; including any compensation
People = 2 ; gallons affects reserve calc
Estimated gal/day = 120 ; 60 gal per person typical calc
Estimated days/regen = 12.5 ; Computed days ignoring reserve
Fleck 5600SXT Settings:
DF = Gal ; Units
VT = dF1b ; Downflw/Upflw, Single Backwash
CT = Fd ; Meter Delayed regen trigger
NT = 1 ; Number of tanks
C = 36.0 ; capacity in 1000 grains
H = 24 ; Hardness-- compensate if needed
RS = rc ; rc says use gallons vs percent
RC = 120 ; Reserve capacity gallons
DO = 28 ; Day Override (28 if no iron)
RT = 2:00 ; Regen time (default 2 AM)
BW = 5 ; Backwash (minutes)
Bd = 60 ; Brine draw minutes
RR = 5 ; Rapid Rinse minutes
BF = 8 ; Brine fill minutes
FM = P0.7 ; flow meter is Paddle Wheel