I guess i should have elaborated, this is within the steps in the manual for the ESC i linked, while calibrating, they call it "binding" when the esc is recognizing what throttle position inputs should be, (after you press the "set" button and while the light is flashing, once it goes solid for the next color, you know it was calibrated to that last step.), i was following their manual exactly, but it would not calibrate full throttle with either of my FlySky GT3C rx/tx combos while the TX was set to the "NOR" function for the throttle channel. as soon as the trigger was released and it was either at neutral or forward (brake side) of neutral position, it would calibrate that step and recognize as an input was given.
reversing the throttle channel to "REV" allowed it to calibrate as it should per manual.
And yes, that is why i was calibrating the esc, because i swapped it to the GT3C setup.