From: garfield hts ohio usa
Well, I fly the traditional aircraft of BC and I fly them at 10,000 feet and I get a 5:1 to 10:1 Kill / Loss ratio when running Night Bombing Strikes.
Daylight Strikes I get about a 1:1 to 1:2 Kill / Loss ratio when running Daylight Strategic Bombing Strikes utilizing the traditional aircraft and flying at about 20,000 feet.
I dont fly at 30,000+ because that is unrealistic and very Ahistoric. There is also a tremendous decline in accuracy of bombing above 20,000 feet especially early in the war. Historical Daylight Precision Bombing altitudes are 18,000 to 24,000 feet for typical historical strikes. Some specific strikes were flown much lower and not until much later were they flown higher, with some specific exceptions. More like 24 to 27,000, they wanted to stay over 20 K as much as they could, as they knew they were into the best preforence range for the LW if under 20 K (for what ever reason, the Raids on Aug 17th, were set for around 18 K and everybody had a fit) (but would change, based on weather/clouds and what nots)
For Night Bombing I keep it below 15,000 feet as I like to hit the target not Aunt Bessy's Petunias in the field outside of town. Please check out my thread in The War Room where I have described in great detail how I build and run a Night Bombing Mission. I will be adding more about other types of Missions as I have time. I am also experimenting with this new version as IMHO it is more historically accurate with respect to mission results and events than the original.
I would try pushing it up to 18-20 K for BC, 15 is just too low, the old joke was the Lancs and Hallies, loved to have the Strilings flying the mission with them, as they knew it was going to be a easy mission, all the Flak and fighters would be down low with the Strilings