Naudet,
Remeber Combat Trim is not meant to be exact, just get you close. CT won't let you fly hands off, but it will keep you from being too far out of trim. You still need to use auto trim modes for hands-off flight. If you use flaps, put gear down, or anything like that CT won't trim properly for that, so keep that in mind.
Now you said "autotrims has the tendency to roll", you mean combat trim right? The auto trim modes should not roll at all. If they do, there may be a problem there. They work fine for me in my Jug and Hellcat.

Still, the procedure I outline in that article is still accurate. The bottom line is to trim your plane for the speed you want to fight at. The easiest way is to fly at that speed and altitude, then trim the plane out. Auto trim can make that much easier, but can do it as well with manual trim. Once your plane is well trimmed for your planned fighting speed, you simply fly off. As your speed changes from that state and you get out of trim, you can adjust with manual trim and count the keystrokes if you like, so that you can get right back to that "perfect" condition when necessary. Remember flaps affect this as well, so if you will be turnfighting with a notch of flap popped, set your trim initially in this condition, then when you pull them in, either just deal with it or manual trim and count the keystrokes. You don't HAVE to count the keystrokes if you don't want to, I'm just pointing out that this is one way you can get the plane perfectly trimmed for a given situation if that is the plan.
Fatty,
Are you talking Combat Trim or the Auto Trim modes?
BTW, the issue is that because we don't have mechanical sticks/linkages, the center moves without your input as you change speeds. Trimming the plane fixes that. Combat trim keeps you "close" all the time at all speeds, and is the simple solution to the problem for most situations.