You are on the right track, you understand that a pre set "automatic" stick routine is the foundation to smooth rolling harriers and other complicated 3d manuvers. Mr. errolw98 describes exactly what is going on technically but in 3d flying there are just too many variables to allow for traditional see and react flying techniques, but this is not necessary. If you want a smooth rolling airplane then you need smooth constantly moving sticks. my automatic stick routine for rolling harriers will break your habit of moving a stick then releasing, or stopping or holding particular values at certain angles of attack. start with your airplane high, stright and level at nearly stall speed - now begin your rolling routine that you have been practicing in the dark at home. when the airplane starts lossing altitude your natural old instinct will be to speed up the right stick movement and or hold more elevator up or down, instead you want to slow the right stick, this will keep the elevator deflected longer where it is needed, slow down your rotation to match your new elevator routine. If you are having big trouble with rudder, try rolling using just ailerons and rudder, catch the airplane on knifedge.

I don't use any mixing or expo, our thumbs work linear so should the sticks, these make 3d more difficult and a set routine impossible. if you insist on expo and mixing you can leave it on your avistar trainer or imac plane. hope this helps, more to follow, ray