Using the instructions provided, it appears to have set things to working correctly again!

Here's what the AIRDATA.AFC file looks like now:

AIRSPEED.NUM_CAL_PTS, 16
AIRSPEED.TEMP_CAL_AD_VALUE, 2590
AIRSPEED.HI_TEMP_SLOPE, -50
AIRSPEED.LOW_TEMP_SLOPE, 42
AIRSPEED.DISPLAY_VALUE_1, 0
AIRSPEED.AD_VALUE_1, 824
AIRSPEED.DISPLAY_VALUE_2, 300
AIRSPEED.AD_VALUE_2, 929
AIRSPEED.DISPLAY_VALUE_3, 400
AIRSPEED.AD_VALUE_3, 1158

I will update after the next flight - but since it shut off 'normally' and allowed me to download my data, I think we have a good solution.

Thanks Shawn!