Hi Kaz and Kanto... my giles has the wing incidence 0-0 out of the box, you should check the incidence with a meter...robart or the new lazer one...unless your plane was made on monday and the wing seat is out ,you shouldn't be changing the incidence.
I have been flying r/c planes for 30 years...started with single channel , very unreliable...Im no expert , just a lot of experience
try moving the C/G back a little at a time , say 1/4" each time, untill the elevator STARTS to become sensitive , then put it where you are comfortable and the plane stunts the way you want.
Ian White....from down under