To each their own, BHB! Glad to see you found a method that works for you!
My personal choice is to leave all the AP channels on. I haven't yet had any problems with heading control, even in combat and evasive situtations. I find using the heading AP for route ingress, auto-turn to target, etc. reduces my workload letting me focus more on putting rounds on target.
I do use the Flight Director when making rocket or bomb runs, which raises the hair on the back of some necks, but my delivery accuracy is seriously affected without it. If anyone reading this has a BS2 .trk or video showing a successful rocket attack run without FD, I'd be very interested to see it.
[PS, "weathervaning" is, in fact, a word, and is a function of an aircraft's weathercock stability. heheh hehehehehe heheheheheheh]
Shoot to Kill.
Play to Have Fun.