#define DECOUPLING_TEST_MAX_HOLD_VARIANCE 5

#define STEPPER_HIGH_DELAY 0  -->  2

#define X_BACKLASH 0

#define X_ENABLE_ON 1

#define X_ENABLE_ON 1

#define dirPin 40

#define COOLANT_CONTROL

#define COOLANT_CONTROL

#define ENDSTOP_NOISE_THRESHOLD 2

#define XAXIS_STEPS_PER_MM 800      //1/16 Ustep

#define RFSERIAL Serial

#define CONFIGURATION_H

#define MOTORS \

so the correct setting is #define XAXIS_STEPS_PER_MM 2048

#define XAXIS_STEPS_PER_MM 10240

At first this is what I had: #define DECOUPLING_TEST_MAX_HOLD_VARIANCE 20  // I increased this to 40 

#define EXT0_MAX_FEEDRATE 100

#define HOST_RESCUE 1

#define EXT0_INVERSE 1

#define EXT0_ENABLE_PIN ORIG_E0_ENABLE_PIN