mmm... I heven't managed yet to bring the C/38 twin in our custom mission...
I have tried changing mission date, tweaking Flak gun's availability dates in UPCDataGE, modifying boat's standard Flaks in their eqp file, but still nothing, depending on mission date and selected U-boat, I was given either the usual single C/30 or a full battery of two 37 mm guns and one FlakVierling
Under this circumstance, it will be difficult to test each Flak gun. Any suggestion?
On a side note, when I tested (by mistake) the 37 mm / vierling guns, they hit the Hurricane at the first shot. Aim with the C/30 is totally out of sight even at higher crew rankings. This gun costantly aims under its target by several degrees. I wonder what is wrong with it