This is the same for me. I have decided not to address the tail until im done with the head and such. I have adjusted the tail servo location and gain back and forth endlessly but still have not found a combination that holds. I am not saying the tail is out of controll it just always needs rudder one way or the other depending on servo location. Unfortunatly I think I made a mistake by not addressing the tail first because I am learning to fly with having to hold the tail in place and find it dificult to fly when the tail is semi balanced. I started improving the setup and parts on the head first trying to battle drift wile learning to hover Now that I can hover and feel reasonable in control the tail is an starting to be an anoyance. I find myself loosing the bird now, more, because i'm paying to much attention to the tail. I do not have the experiance to now the differance in feel between rate and HH but I will soon.