<span style="font-size: larger">Need help programming throttle settings with the Spektrum DX18 and Kingteck 100 ECU during learning programming.

I am getting a RC Signal Error during set up of the ECU Learning using the digital throttle trim lever. When I look at the servo setup page in the DX18 transmitter,it shows all travels on the right side of the screen set to 100%, but the servo monitor screen on the left shows a -128% reading on the throttle with the digital throttle trim in the full low position. This is the position I currently have set as fail safe for turbine stop.

If I raise the throttle trim to a slightly lessor position, the RC signal error goes away on theGSU and all looks normal. My thought is that the current default -128%in the throttle trim low position (displayed in the servo monitor) is toolow and outside of the KingtechECU calibration range. Can I just adjust throttle travel to a position where the servo monitor screen shows low stick and trim at 100%? OR Am I missing something important? This is my first radio with digital trim so my confidence is low.</span>