i think i am beginning to understand the dual rate vs epa thing better... at first you must make sure that the model is physically adjusted properly, i.e. the servo rods arent too long or too short etc... somewhere in the menus of my tx it has the option to set the steering's left and right maximum independently , and its labelled as 'epa'(end point adjustment), you dont change this often and you only change it when youve done some major changes to your steering system... and then right where your thumb will go on the handle theres a clicky wheel, that you roll to increase or decrease the sensitivity of the steering wheel as a whole, and its labelled as 'd/r' , you change this depending on which track you go to , maybe also the condition of the track...

oops i forgot i was meant to pretend that im talking about planes, but im sure that there are analogies for helping newbies understand endpoints vs dual rates in planes