No Single Direction ADC in FW v6.06???

Hello.
I have been bashing my head against my project for 4 hours now trying to figure out why I can't get any setting to work for a single direction ADC throttle for a Ryobi RM480e riding mower.  No matter what I do, the Flipsky FSESC75100 Pro V2 controller assumes a center point of 2.13v out of a range of 0.84v to 3.44v.  My current ADC general selection is "Current no reverse brake ADC2" with nothing connected to ADC2 yet (I have tried all the "current no reverse" options).  Right now, I'm just trying to get throttle to work correctly before worrying about switching between forward and reverse with a digital input.  What the controller is doing is subtracting the center voltage from the max voltage and then giving me a range of only 0.84v to 1.31v of throttle.  I simply want the controller to not invoke a center value.  Every attempt I have made through the setup input wizard and manual mapping has not solved the problem including minimizing and maximizing the center voltage value.  Please help.
Thanks,
Roger