Wow thats just very good job on this mod!
This one reminded me of a very small, but VERY cool deck gun sound mod for SH3, which i cant find anymore

... it was some reworked gun sound, nothing special so far, but what made it so damn awesome was after the shot you could hear the cartridge falling onto the deck...it added so much immersion to the game back in the days, basically it was the start for SH3 modding for me
Too bad im not familiar with sound editing, or i already would be reworking your mod
Maybe you can do a small addon mod to change sub deck guns to have climpering cartridges?
Im not sure, you even could do that for the bigger guns for playable BBs?
But could have the side effect that you maybe can hear the cartridges falling from ships kilometers away...
Anyway, GJ on this mod, i just hope i have inspired you a bit!