Radio DX7 vs DX8 or suggestions

[Hotwheels]

You guys have been a big help as well as reading the manual. I have a better understanding of the DX8 and the 8 channels. Only thing I am stumbling on right know is the throttle neutral/centering. When I go thru the process of rebinding after I have things set up I get a transmitter "warning throttle high" on the screen and alarm in transmitter warns also. I have the throttle set as dead center as I can when I rebind? Has a Novak Rooster reversible speed control installed. Unfortunately don't have book to esc. Checked Novaks site not able to find it there. Will search online, from what I have read it is one touch setup. If what I have read so far the one touch also will lock out reverse. That part I have figured out. After initial binding with throttle all the way down receiver stops flashing Tx indicates bind all good. Then I shut of power to truck then to transmitter. Next plug bind cable back in to receiver set throttle to center turn on power to truck, next hold trainer button down while turning receiver on that's when the warning and alarm go off. Any idea what I may be missing.
Thanks,
Lou