After 15 or so reload/try/fail cycles, I have it worked out.
I was wondering why when I would send AoB to the TDC the relative ship orientation looked really screwy, but I just categorized it under "quirk" and kept plugging away.
Bad idea.
Sending range/bearing data twice or three times, as a couple of you mentioned, was the key. A quick look on the attack map would have shown me this much earlier, but I can be a bit wooden-headed at times.
Both things I overlooked in the tutorials.
Still, it was quite gratifying to see all 4 torpedoes hit the target in rapid succession, finally.
Thanks for all the support, folks, and yes, I will be checking out the Skipper's bag o' tricks.
P.S. Throughout the 15 or so retries, I had torpedoes going every which a way. It was kinda humorous, as I was thinking "Okay let's see what happens now... sheesh, if I wanted to shoot the torpedoes behind me I would have used the stern tubes..."