Uneven throttle is probably caused by differently calibrated ESCs. You might find strange need to trim your copter heavily.

Few tips if you have uneven throttle or strange banking or flipping when giving throttle:

– New copter: clean EEPROM (Arduino example eeprom_clear: change the value 512->1024)
– New copter:add line “#define MOTOR_STOP” to config.h
– New copter: always calibrate the ESC’s using the define ESC_CALIB_CANNOT_FLY (REMOVE PROPELLERS!)
– Now upload, run calibration, remove ESC_CALIB_CANNOT_FLY and upload again
– Use MultiWiiConf: calibrate ACC (and MAG too..)
– Check trims: ROLL, PITCH, YAW should all be 1500 when sticks in neutral
– Check functionality without propeller’s
– Remember: SimonK ESC’s CAN be calibrated to different throttle range

I’m using:
#define MINTHROTTLE 1064
#define MOTOR_STOP
#define MAXTHROTTLE 1850
#define MINCOMMAND 1000