Jayinct, I'm glad you're receiving more assistance with your potassium consumption issue.
Reviewing your photos, the program wheel on your unit is definitely not the same as shown in the service manual but the manual does state as a NOTE on page 7 that "the program wheel shown may be different than the program wheel on the product". If your white dot is at '2' (it is not visible in your photo), it is definitely programmed to regenerate @ 200 Gals, not 2000. The installer obviously did not confirm your program wheel is the same model as shown in the manual and really did not confirm the programming when you had him return to verify.
In viewing your photo showing the pins, I realize there are two other discrepancies, one of which I am to blame.
Based upon the information you provided, I stated there were 6 holes (12 minutes) between the pin grouping at #68-76 to the two at #88 & 90. As we are talking the number of 'holes' BETWEEN, this would make it 5 holes, not 6. This was my miscalculation.
In close inspection of your photo, I do not see a pin in #68 as you indicated, but the 5 pins are in #70, 72, 74, 76 & 78. This then further reduces the 'holes' before pin #88 so there are only actually 4 holes (8 minutes) set for your brine fill timing.
Your brine fill flow is actually: 4 holes X 2 min/hole X 0.5 gal/min = 4 Gals. Therefore, your potassium consumption is 4 Gals X 1.75lbs (with ~67F brine water) = 7 lbs per regeneration.
Your potassium efficiency, if you only correct the regeneration interval to 2000 gals, then works out to 16,000 grains (2000 gals X 8 grains) / 7 lbs = 2285 grains/lb. This continues to be IMHO, poor efficiency but again, I'm unfamiliar what is expected when using potassium. Perhaps the other potassium experienced posters can offer suggestions for better efficiency.