Well, I don't know what you're getting, but in my v1.8, I am getting:
December 1941 from the bridge:
December 1941:
January 1942:
Spring 1942:
Summer 1942:
Fall 1942:
There are no starts for the Cachalot after Fall 1942, though the boat goes into 1943, but then "dead-ends", and the player is transferred to a new boat... Of note is the aft mounted gun, and the J hydrophone head entirely too early... I think we have those issues resolved in the next version, but it has been a few weeks since I was in the files... been doing other things, and just had cataract surgery on both eyes... what a difference THAT makes - wowsers! I can see again!!! Anyway, don't know about your Flotillas fix, nor about whether Jimi Madrid's Sub Management does OK with FotRSU...