Well, I ain't no experten, but...
I use trim a lot, but mostly auto trims. (Some call it auto pilot.) Climbing out, I am in "speed" trim, enroute (or running on the deck) I am in "level" trim.
In a fight, I'll use "angle" trim, or the manual trims. In a straight dive or zoom, I unload and set "angle" trim. This keeps the plane trimmed as the speed changes, and minimizes E loss. When I have to maneuver during a large speed change (B&Z), I use the manual elevator and aileron trims, always trying to keep the stick near center. This gives me more precise stick control. In a turn fight, I will sometimes use manual elevator trim to keep the stick near center. The second that I am out of the fight, I will set one of the auto trims to maintain trim and E.
I have the auto "angle" trim mapped to a button on my throttle, and the manual vator and aileron trims mapped to a hat on the throttle. So, I can be trimming with my left hand, while flying and shooting with the right.
popeye