The 5inch Proximity fuze model HiTech is using seems historicly on for the auto 5inch and rate of fire from 4 destroyers. I don't know if HiTech is programing 100% of the fuzed rounds to work 100% of the time though. 100% of the rounds working did not happen in real life. The british had about a 79% kill rate against the 400mph V1 using the fuzed round.
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For more information on the VT fuze, see the Ralph Baldwin book, "The Deadly Fuze - Secret Weapon of World War II." An analysis in this book of the 278 aircraft shot down by VT fuzed projectiles between October 1944 and August 1945 indicates that only 46 of these would have been destroyed if time fuzed projectiles had been employed. However, Will Jurens, noted ordnance authority, estimates that Baldwin's 6:1 ratio apparently assumes that 70% of the VT fuzes worked. A 50% failure rate - the Navy's lower limit of acceptability - meant the effectiveness ratio was closer to 4:1. In comparison, mechanical time fuzes such as the Mk 18 typically worked about 90%-95% of the time.
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The earlier naval stats against kamikaze was 310 fuzed rounds per plane.
Type of Attack Planes Shot Down Rounds per Plane
20 mm 40 mm 5"/38 MT* 5"/38 VT
Kamikaze 24 27,200 6,000 1,000 200
Non-Kamikaze 41 30,100 4,500 1,000 550
* MT = Mechanical Timer (i.e., Time Fuzed AA Common)
http://www.navweaps.com/index_tech/tech-075.htm