How is it surprising when most USAAF FGs didnt even enter the ETO with US built a/c untill late 1943-44? Whats the date for the P-51, Dec 43? 1st escorted raid by P-38s in the 8th AF was October 1943, 55th FG. RAF had been in action for over 3 1/2 years by then. I will mention the US 4th FG which was the USAs "pioneer FG" and they flew Spit Vs untill 43.
Ask any Bf 109, Spitfire, Tempest, F6F, F4U-1, P-47, Ki-84 or P-51 veteran and they will express the same level of confidence in their a/c. Fighter pilots were not by nature, timid people who fretted that their plane might be a few mph slower...Fw 190 pilots express the same level of confidence, no surprise as it was one of the wars finest fighters.
As for your assertions that it was just a big "gang bang", I will throw some facts on that:
You can get the books if you like, "2nd TAF Vol.I" and "2nd TAF Vol.II" by Christopher Shores.
I will give some illustrative examples, again, I wont quote the entire works, much as I would like to...and I will paraphrase for brevity:
28 June 1944:
401 Sqn engages 20 109s and 20 190s S. of Caen.
411 Sqn engages 15 109s and 190s S. of Caen, and again later in the day, meet another similar sized group in the same area.
401 Sqn engages 12 190s later in the day.
-Thats some of the action.
RCAF Spits claimed 26 LW fighters, losing 4 a/c and 3 pilots, the -LWs own records indicate they lost 29 in the fighting- . No USAAF claims were made.
29 June 1944:
Similar fighting, with RAF/RCAF claiming 13 while losing 8, USAAF claiming 10 (in different sector). -LW own records indicate they lost 22-
30 June 1944:
441 Sqn engages a squadron of 109s near Argentan.
401 Sqn engages a squadron of 190s near Argentan-Falaise.
-Again, some of the action.
RAF/RCAF claimed 21, losing 4 fighters, the USAAF claimed 7 (in different sector) and the -LWs own records show they lost 22 in the fighting-
Several things are clear from reading about the fighting on the western front. Firstly, despite both air forces possessing large fighter contingents, much, if not most of the fighting was done "ambush style" with several squadrons involved on each side, and often with only flights and single squadrons attacking similar sized units. Allied fighters could easily be engaged with a larger enemy force in the air, despite possessing a numerical advantage overall, and that the LW suffered just as many serious reversals in combat as they dished out, despite the BBS mythology to the contrary...
F/L Kennedy (quoted from the 28th June combat):
"We were jumped by a squadron of Fw 190s out of the sun. A good old fashioned scrap followed right down to ground level. My new Spitfire IX was too much for a Focke Wulf pilot who stayed for the scrap. He had a good a/c but could not turn with a Spit IX, and when I got on his tail I knew I had him. One short burst and he was into the trees with a great flash of fire".
Happy Remembrance Day.