Flap-to-elevator mix to get elevator trim using the flap elevator lever for flap control. Auto Land is not possible using this mix as shown. The trim rate of 15% actually will produce a 30% elevator trim when the flap lever is pulled from closed to open flap position. This is due to using the offset which changes the normal +100% flap position to the new zero flap position.
I haven’t looked closely at my12X but on my other JR transmitters +170 represents +100% and -170 marks the -100% position. An offset of 180 may make the new zero position a bit more than the previous +100% mark.
Auto Land is fun to play with. When the throttle stick is moved passed a designated position, the flaps close and the elevator trim goes to neutral. It’s good for Touch & Go. Otherwise, it could be a nuisance. Using the FLAP SYS, it cannot be turned on and off in flight. Using the lever and program mixes, it can.
Allan