This is a very interesting discussion, but raises more questions than answers.
Notice in the photo of LST-16 that Allen posted above, that the tail of the L-4 is raised, with the wheel in a channel. It suggests a very early trial arrangement.
The wiki entry for LST-16 also suggests this vessel was not commissioned until March '43, & it's first operation was Husky (July '43), so the "Torch" star is a real puzzle.
Perhaps LST-16 was used for a trial very soon after first arriving on station in the Med. The wiki entry suggests she only carried 2 x L-4Bs. Given the issue of the raised tail configuration for launch, I'm not sure how this can be achieved in CFS 2 anyway...
... perhaps an "invisible" trolley, attached thru the DP as a weapon, & dropped after launch? IIRC Baldy did some interesting stuff with his German glider/transports...