There is a description of the special mission where the cuties were tested is here:
http://www.usshawkbill.com/366/366patro.htm
Scroll right down to the bottom to read it. The only detail I found strange was the description of the dimension of the cutie being half the normal diameter.
I came across this page a while ago whilst looking for info about USS Lagarto and Hatsutaka, the sinking of which is also on that page and is a fascinating read.