My copy says the climb was just about equal until 23,000 feet, after which the Fw 190 fell off. Brown did like the Fw 190's control harmony better but decidedly not the stall, which resulted in a spin if the pilot was not on his toes.
The radial 190's always were starting to lose performance above 20,000 feet faster than the competition, but that did not detract from their good control harmony and manners when not stalled. The Fw 190 was and IS a superb fighter.
Of course, all this started in a thread about the Spitfire XIV versus the Bf 109K, which were later birds than the A-3 and Spit IX, at least the next set of "upgrades." I never said the Fw 190 ws a bad fighter, dedalos. I said that for all it's fine characteristics, climb wasn't the one usually noted as being superior. If you were to compare just the A3 and Spit IX, you'd be much closer to having a climb to brag about, but they weren't the only variants flying about and the other variants of the Fw 190 didn't match that climb rate. But ... for the Spit IX versus the Fw 109 A-3, the climb appears to be quite comparable with the Fw 190 still being a bit less.
If you go look here:
FW 190 A-3 Performance, the performance charts at combat power don't show it to be as good as the Spit IX at combat power, and they DO have charts of the BMW 801 performacne limits.
Perhaps you have some links to German flight tests showing the rate of climb at operational power settings? I'm not talking about experiments, I'm talking about service limit power settings. The BMW 801 service limits, after some service experience, were anywhere from 1.28 ata at 2,350 rpm for 30 minutes to 1.42 ata at 2,700 rpm for takeoff and 1.35 ata at 2,350 rpm for 3 minutes.
This chart (
http://www.wwiiaircraftperformance.org/fw190/fw190-a3-datasheet-29-11-42.jpg) certainly doesn't show it to be exceptional in any way at climb, though also not bad.
In fact the Fw 190 A-3 accounted for 910 of the slightly more than 20,000 Fw 190-series aircraft built, or about 4.4%. Coincidentally that is just a bit less than the Spitfire XIVs completed (957). Interesting they made almost the same number of Spitfires as Fw 190s in total.
In truth, I'm not sure why you are arguing. Nobody who knows anything about WWII ever suggested the Fw 190 was a bad fighter. Most including me consider it to be the best German piston fighter of the war. I consider the best to be the Fw 190D-9. It was fielded in sufficient numbers to be able make a difference and it proved to be a good one.
According to the veterns that I have heard speak at events, all foreign fighters were flown and maintained by experienced aircraft mechanics; they didn't use rookies for captured aircraft. The Fw 190s we had for evaluation were not mysterious, just different. Most captured enemy planes were flown anywhere from 10 - 25 hours or until they broke without a real chance for repair, after which they were usually scrapped.
The Germans did the same with captured Allied aircraft. Nothing overly impressive about any of the evaluations. We DID use German mechanics when testing the Me 262 after the war, but none were flown overly long since the engine life usually wouldn't allow that and we hardly ever captured one with zero-time engines.
As you noted above, our pilots weren't particularly fond of the single power lever in the Fw 190, but did allow it was better and easier for combat use. They weren't so impressed for formation flying or cruising. It wasn't that they didn't understand it, a single lever is almost self explanatory. It was that they could not get fine adjustments with it for economy or for formation flying. At least that is what was said in the US evalautions I have read.
The point was a bit unimportant after the war since they went fairly quickly from pistons to single-power-lever jets anyway. During the war, we never had single power lever setups in a production fighter and didn't after the war until we went to jets. But you know that.