[Laurent Rizzotti]

I think that Japanese fighters defences were rather inefficient around 30000 feet, where the B-29s flew. But B-29s were also rather inefficient until they switched to night low alt incendiary bombing in March 1945.

So if the presence of Japanese fighters was the reason the B-29 flew at high alt, such increasing jetstream effect and ops losses and reducing the precision of the attack, at least these fighters had a greater influence that their A2A kills will show.