From: PDX (and now) London, UK
In 2/44 myself, and I have what you have, basically. N1K1 and 2, J2M2 and 3, Frank Ia, Tojo IIc and Tony Id. I do use Oscars and Zeros in CAP but don't really expect they'll do much.
Corsairs, P-47s and Spit VIII eat everything alive. I almost hope to get a P-38 sweep these days!
I had thought it was partly to do with our HR of 2nd best maneuver band, so they always sweep at 35k and mine are limited to 31k. Because of this rule I've tried some unorthodox settings. I put all at 10k, and that got creamed. All low layered, like 14k, 12k, 10k. Also not good. Did traditional layering of 31k, 25k, 20k, 15k, 12k and that didn't work either.
If the Allies can sweep with 4-6 groups of their best, there seems to be nothing that gets better than 1:3 in kills, and that is when he's coming at a big base with 200-300 on CAP. Pilot quality seems almost irrelevant, except the exp 70-80 guys seem to get WIA more often than KIA.
"Success is the ability to go from one failure to another with no loss of enthusiasm." - Winston Churchill