Radiomaster TX16S Throttle Calibrate

[AirScooter]

I have a new Radiomaster TX16S that has been giving me fits as I try to get it to return to -100 (Throttle Off). It consistently returns to about -11. I have been through the Calibration routine a number of times, Debugged the Analogs and gone through the TX very carefully to make sure I haven't added anything to the inputs that might have this output on the channel.(I am AETR) I simply cannot find the source. I even went through Companion thinking I read something to the radio that I wasn't seeing.
I am wondering if I misunderstand the analog debugging process. The TX's user manual is not helpful on the subject. If someone could comment on the problem in general and specifically go over the analog debugging process I would be very grateful.
Thanks,
AirScooter

[Kilrah]

You probably didn't center the stick physically at the first calibration step.