Edited original test, added spit 9 and fixed a messed up number in the 190s results.
Note the P-47D-40 only got 6,700 ft out of the dive n zoom, probably have to start higher up to see any real benefits from its added weight.
The Spit 9 and 190A5 appeared to have about the same terminal velocity in the dive, around 460-470 mph true (using the film viewer).