And the different guns require different kinds of "windage" too - .50's are pretty easy, German or Russian 20mm's not so much.
As for tracers, I think the answer is more on a per-person basis than any hard and fast rule. Yes, having tracers off lets you see better and doesn't give you away. But if they help you land a solid burst on the first pass, then who cares about stealth? The factors include:
- How often do you fly? If you're on every night, you should maintain a pretty good feel for your guns and not need tracers. If you fly once or twice a week or less, you're a little rusty every time you're up.
- What do you fly? If you always fly planes with the same kinds of guns (.50's, Hizookas, German 20's, etc.) then again you should know the gun well and not need tracers. If you're like me - and fly half a dozen different planes any night you're on - tracers help a lot.
- What's your connection like? If you're on a crummy connect - or one which comes and goes - then your gunnery confidence can get destroyed in an evening of rubber-bullet syndrone. Tarcers will quickly let you see that the shots which "should hit" aren't and let you adjust for the warps du jour.
- How much ammo do you have? If you have gobs of ammo (a P47, Fw190, etc.) then you can afford to leave tracers off and spray and pray a little - you have enough there to dial it in with the hit sprites.