He219's performance was not nearly as good as claimed. Never broke 400mph in service and had a climb rate barely above 2000ft/min. Most of the numbers you can find for it are Heinkel's claims, not actual Luftwaffe experience.
The 416mph number sees for the He219 was for striped a/c > no exhaust shrouds, no antenna, many guns removed. Hard to be a night fighter without radar and the glow of exhaust flames telling all where you are.
