A couple of books come to mind; Samurai an autobiography by Saburo Sakai with Martin Caidin. Zero Fighter published by Ballantine books. There was also an article I read a very long time ago that was part of a study done by US Naval Intelligence on the various aircraft used in Japanese Kamikaze operations which went into the the performance figures and limitations of the machines used for those operations. I too have come across those 400 mph figures and found that they were estimated figures based on extrapolations from the perfomance figures of the late model Zeros. I'm sure with a little digging you can come across that info. The G forces involved in trying to recover from a terminal dive have easily caused structural failure in the wings as well as other structural parts of aircraft that were far more ruggedly built than the Zero. I know of one case where a P 51B Mustang was able to surprise a Messerschmitt 262 and the P51 pilot, knowing he had the German, went into a very steep power dive accelerating well past the never exceed speed (VNE). The German pilot spotted the P 51 just after he had initiated the dive and spooled up as quickly as the Jumo's could at that time. The upshot was that the 262 accelerated away leaving the American pilot with the choice of either auguring into the ground or pulling out of the dive. He succeeded in pulling out at the cost of permanently distorting both wings, which made the plane just barely flyable, and by hearing a very loud sound as if a giant piece of fabric was being torn in two. Upon landing he found that the tearing sound had been caused by a line of rivets, starting just aft of the canopy and extending all the way back to the tail, that had literally been popped out from the bending forces that the fuselage had sustained in the recovery.