Can't figure out BLTouch offset (no replies)

I cannot figure out how to get the leveling values produced by the BLTouch to register. I'm using a custom 3D printer and Marlin bugfix 2.0.x. This is what happens:

G28 to home printer
G29 and the four corners of the bed are measured.
echo: M420 S1 Z0.00
echo: G29 W I1 J1 Z2.43446
echo: G29 W I2 J1 Z2.16985
echo: G29 W I1 J2 Z3.25292
echo: G29 W I2 J2 Z1.50892

I start the print and the print head is about 4mm above the bed. So I assume its the
#define Z_PROBE_OFFSET_FROM_EXTRUDER 2.4 // Z offset: -below +above [the nozzle] Line 768 Configuration.h.

Just to test, I set this value to 10, so
#define Z_PROBE_OFFSET_FROM_EXTRUDER 10 // Z offset: -below +above [the nozzle]

I restart the print and again the nozzle is about 4mm above the bed.

Next, I change the M851 Z offset from -2.7 to -10.

EEPROM is enabled for sure. When I send M503 I get my updated values but they seem to have no effect.

I restart the print and again the nozzle is about 4mm above the bed. What value do I need to change to get the nozzle to adjust for this offset?

Thanks in advance.